Sorry to say that, but the tiktoc you linked to is just pure islamic propaganda. It mentions Wikipedia as a source, but in Wikipedia one can read:
"The manuscript was reportedly found in Cyprus in 2000 in a police anti-smuggling operation, and had been in a police repository since then. Photographs of a cover page were widely published, on which can be read an inscription in a neo-Aramaic hand: "In the name of our Lord, this book is written on the hands of the monks of the high monastery in Nineveh, in the 1,500th year of our Lord."
This finding was reported by the mass media as being a 1500-year-old manuscript of the Gospel of Barnabas with prophecies of the coming of Muhammad. No further report has been published."
So it seems to be from the 1500s. If we dive deeper, it seems to be a fabrication derived of a fabrication by an Inquisition Bishop who lost the Pope election.
If something claimed to be "authentic" is written with golden ink ...
But it may be based upon older scriptures, which are not available to us.
Please be always careful with statements by religious fundamentalists, they like to turn it the way they need it to support their indoctrinated belief /MK system and to keep their worldview stable.