I think it's like anything else, really -- these people are "gun people" and we are "Romanov people." (Not saying someone can't fit both categories, just that all media is geared to an audience, and special interest non-fiction media even more so.) This guy seems to be a "gun guy" who has read a few Romanov books. I get it -- I'm a "Romanov person" who knows a bit about guns.
Ultimately, he's funny, and mostly accurate. Obviously, I disagree with the premise that Nicholas was "Bloody" and deserved execution of any kind -- and the Maria and the guard myth is a mess, of course. But it's a channel about historic firearms, showing a lecture given to a firearms collectors' club (not a lecture given specifically TO be filmed), and the whole thing is geared toward people who study and collect such antiques.
The nitty-gritty gun stuff that's informative to a Romanov buff who's read all the usual books, etc, starts around the 19 minute mark.
