He claims they are in Codex Vaticanus
At 2:26 in the video he explicitly says that the Codex Sinaiticus does not have “666” and instead has these symbols.
But he’s wrong as 3 minute search shows, the greek words for 666 are right there and the symbols are not. He should withdraw the claim about Codex Sinaiticus.
He also says he found these symbols in Codex Vaticanus, but Revelations was not in the original 4th century edition — it was added in an appendix in the 15th century.
There are many editions of revelations that predate this 15th century version, and none of them have the symbols he is talking about.
He should withdraw the claim that his theory comes from the earliest editions of the bible, since it isn’t in any of them, and admit it comes from the hand of a 15th century transcriber.