When I was a child, I was reading the newspapers (I always used to read anything...) and I found them inaccurate about cartoons. I became passionate on military matters, then I found them inaccurate on military stuff. I studied history, aeronautics, then IT, then Economy and every time I became proficient in a subject, mainstream media became inaccurate.
It is positive that our information doesn't rely on mainstream media anymore, since YT, blogs and the wider Internet world do provide a viable alternative on many subjects.
In this specific case, though, the author should be intellectually honest enough to present the information leaving room for some doubt.
I am YTer, and when I am not sure I say that I am not sure; when I am just speculating, I make it clear.
That is enough: the intelligent viewer will recognize the need for further analysis.
Shutting voices up, though, is the wrong thing to do in the context of the world we live in.