No, they are generally not reliable enough. In fact, we routinely challenge stuff claimed in youtube videos.
Also "go watch this video" is as unacceptable as "go read this book". It is not a way to reference, it is a way of appealing to authority.
A magician speaking about their craft is not unsustainable in conjunction with more evidence, but it's not enough by itself: is what they are saying a controversial opinion? Is it a widely accepted fact in the magician community?
Finally, use precise word-for-word citations. A handy wavy summary of someone else's long dissertation is not acceptable because it may not represent their though, but your opinion of it (which is irrelevant in the context of this site).
This site is all about evidence, and not about opinions. Your answer should be 99% evidence and 1% opinions, instead of the opposite, like your "wall of text" answer.
For completeness these are the comments left by the downvoting user(s) and moderator on deletion:
Ron, this may not surprise you, but you need some decent references. You make some big, bold (wrong) claims here. You need to show that hypnotic suggestion can do what you claim. You need to show that the BMX bike preference wasn't simply substituted in to replace what was originally written. You need to show it is HIS innovation to do the same effect twice with different methods to make it more difficult to discern. (Good luck with that! It is common practice.) You need to show he is generally honest when he, himself, claims he is dishonest when on stage. Etc. Etc. – Oddthinking 20 hours ago
To which you replied and then Larian posted:
Ron... Evidence by YouTube isn't reliable enough for the standards of this site. I am going to delete this answer, as I have done all the other unreferenced answers). Feel free to add in more reliable and trustworthy references, and I will put the answer back. – Larian LeQuella♦ 16 hours ago