Even if it isn't true some of this will look legit to an average youtuber (not a member of this forum).
I saw the video and my first thought was: "this guy spent a lot of time digging up dirt and throwing it at blockstream and theymos, some of it is gonna stick".
If you're smart you can se that it's a pile of accusations. He run a narration like it was an opening statement of a court case, so that in the end we'd all believe him and want to burn some people at a stake. I'd prefer it to be a research showing statements from both parties, but we can't have it all, right?
As for Adam Back he sounded distinctly unenthusiastic until 2013.
It's interesting he had that gap before the white paper came out. There's not enough evidence but that, c++ and his double spacing...