Google won't give a shit about anything until it draws people's negative attention - only after that they'll do something. The banning of guns videos is following this pattern. It's not because of propaganda, but because of fear of losing profit and money.
All of this was done by YouTube or rather Google only because of fear of drawing negative attention. Attention that could possibly lead to anger from customers and sponsore, resulting in massive lose of money. Google do not want to do that. They're always trying to be polite and friendly so the people could use their services all the time and thus bringing them more money. And Google will do anything so the things will stay that way.
To be honest, that was predictable. In fact, YouTube had done stuff like before multiple times. Do you remember how long Elsagate-stuff was(and in fact still is, but not as quite as before though) a thing? And how YouTube started doing something on this shit only after many people and journalists started complaining about this? Or when only after journalists noticed ads from big companies on videos that contained outright illegal on highly controversial content - only after hearing complaints YouTube completely changed monetizations rules, because of which not only people with "shocking" content losed their money, but also a lot of innocent people losed their main source of money for living?
To add my 5 cents: one of the videos on "one of my YT channels" got shadowbanned for tutorializing ArmA3 weapon modding (adding scopes, lasers, flashlights and so on))
I can't imagine Google would want to shut down say, Forgotten Weapons. That's why I said "all". However, I seriously doubt they'll actually strictly enforce these rules. They'll probably be applied vaguely whenever media attention is focused on something. I'm not defending them, just trying to be objective.
It's much worse than that. They don't want you to show how to disassemble a gun, install parts, or show firearms with magazines that hold more than 30 rounds.
youtube/google wants to ban every single video that contains and/or promotes the usage of guns. It doesn't even matter if it's a real life video, a gameplay video or a movie trailer