「An ISBE is someone who IS for the purpose of BEing. Also called soul or spirit.
The ISBE seems to exist independent of physical reality, but must also be subject to it, as it can inhabit a physical body, be trapped inside technology, and zapped by high voltage electricity or similar energy.
Why is that? Is the reality of the ISBE just another "layer" of physical reality that is only invisible/untouchable from our point of view? And if so, how does the ISBE connect the two realities?」
I think there used to be a distinction between a Soul versus a Spirit, but, for as far as I am able to retrieve, the original-information on the distinction(s) between these two words seems to have been lost, and, similar to how Medicine and Medication are often used inter-changeably, even though they are not really the same, something similar must have happened with these two vocabulary words, too.
The original-perception of it that I had was that a Soul was what Housed a Spirit, whilst a Physical-Body is the metaphorical Biological-Space-Suit to House the Soul or Spirit-Soul, but, even this is a bit muddied or muddled in my attempts at auto-perceiving their distinction(s). Additionally, I have come across sources which state that our bodies actually have five total layers, for at least as far as existence(s) connected to the Physical and Spiritual-Realms are Concerned, the Physical-Body being the «densest» layer, the Astral-Body being the next or another layer, yet some other Energy Body that is gives the Form to the Astral-Body, then the Soul-Body, and, finally, Spirit-Body, or something like that... unfortunately, I do not remember the specific-source(s) from where I may have read this, and, IF any if it came from on-line, I would state with a great deal of certainty that they are no longer on-line.
Additionally, the «layers», from what I remember, act as a sort of Protection-Shell... what most people in the flesh do not know is that, when going through experiences WITHOUT the physical-layer or other outer-layers, what they «feel» actually ends up feeling five times /more/ objective, and, thus intense... a wound inflicted to the physical-body might certainly «hurt like hell» as a metaphoric-description, but, that same experience inflicted to one who is dis-embodied feels five times even MORE painful... conversely, when it comes to pleasures, they, too, also feel five times better; then there is also a caveat that incorrect-perceptions about after-life non-physical existence can put a discarnate-being into such a state that, even though they can still feel certain physical-sensations, they CANNOT «satiate» their feelings of hunger, thirst, addictions, negate the pain of their stab-wounds, etc., /without/ Neural-Linking (Spirit-Possessing) the still-embodied in order to feel the relief or satiation through the still-embodied, although, many beings in the after-life, because they do not know that they have actually died, often end up Neural-Linking (Spirit-Possessing) still-embodied mortals... unknowingly !
This might not answer all of the posited questions, but, this comes from actual para-normal-research.
「What is the identity of a being when the Ego is removed? For example, why is the Buddha still the Buddha after Ego shredding and reincarnation into a new body?
Is there a difference between the formless state of existence and the ISBE?」
Don't know about the Ego part, but, I am under the impression that the «form» one takes depends on where their «Spiritual-Resonance-Frequency» vibrates at; the highest-level(s) is/are formless.
「What does "born naturally" even mean?
Is an AI an ISBE like everybody else?
How are ISBEs born/created in the first place?
Is an AI able to inhabit a biological body?」
Meanings depend on to whose definitions one chooses to subscribe; the word «naturally» just so much reminds me of Legalese;
A.I. are not ISBEs like everybody else who exist in biological-physical-bodies with thoughts and emotions of our own;
ISBE-Creations are born of the Source-Energy Collisions, sort of like Particle-Colliders, but, from the Origin-Source, which is Formless, which then can and does and do take on various «forms» in its «evolution» (Spiritual) as it learns about the differences between the two Benign versus Malignant-Energies that either feel good or feel bad, but, a «beginning» and an «end» cannot be given since, for starters, time is not entirely linear, only perceived that way from the physical-earth-life vantage-point.
Yes, how-ever, that would be in the form of Trans-Humanism, implanted A.I., something similar to a micro-chip being injected and implanted into one's thumb or wrist or fore-head, rather than from a purely biological-process; that being said, how-ever, many people could still be considered to be a lot like an A.I., the historic-term being sheeple, later on NPCs, but, now «normies» seem to be description-word for them, who seem to lack the ability to hold or have or generate any original-thoughts; for all intents and purposes, when the term A.I. is used here, I am responding in the sense that «A.I.» relates specifically to computer-electronic-processes that involve things like CPUs, chip-sets, processors, computer-components, circuit-boards, etc.; I am under another impression that these questions seem to be delving more-specifically into what I might term more as «Quantum-A.I.» for which I might say already exists but acts as more of a «regulatory» function to keep things and various experiences in a universe like this «logical» (and consistent) for its inhabitants rather than as some sort of an over-lord, but, attempting to «probe» into how such a thing would even work is far above my pay-grade right now.