This is a valuable thought experiment.
I did not give tacit consent by reading the word. But what I did do is influence my field of consent and allow methods of persuasion (whatever they may be) to implicate my psychology toward consent.
Perhaps if there was a sign saying "by clicking you agree to the following terms" and a giant adhesion contract in fine-print that nobody likes to read, and then if it turns out that it included the fact that you can come into my house and take all my things . . . there's a chance that I might argue and say the consent wasn't tacit, or there might be a side of me feeling the guilt of my own contradiction (yes, I remember clicking the box and denying the opportunity to read because I just said to hell with it I really want to know what happens on the other side of the click, without the boring and time-consuming sacrifice of reading).
With that said, the "words are spells" has some implications. Yes we're influenced by how we associate the sounds and spelling of words when they don't necessarily mean the same things at all.
And on the same token, a bit of healthy skepticism is fair. If I have the tenacity to insist that FAFHRD, whatever it would mean, was not consented by me just by clicking, then I am more likely to refuse the implications (like the drink that says FAFHRD on it and persuades me to drink it not for any rational reason but just because I saw it earlier so I feel like the connection is a reason . . . like inductive reasoning but without a cause).
Anyways what I'm saying is: we do indeed get controlled as a society by just clicking things and remembering things, especially when we have a terrible track record of understanding *why* we do any of it. And likewise, we should maintain that consent is malleable and it never has to be tacit, even after death. Believing a contract is eternally binding is a really bad and incorrect belief in my opinion. And sometimes actions are highly misconstrued as consent. It's the misconstruing that's often more damaging than just the chicanerous contracts themselves.