CPG Grey's videos re the City are a bit of fun that he slapped together in two or three days, not documentaries.
It made me realize the larger studios and productions have access to lots of accurate “fluff” like historical reels. They even have budgets to take real crews to locations. Makes me rethink the amount of time I spend on YouTube.
Look instead at the channel. Some channels make serious efforts to cite their sources and justify their claims; others do not. It's hard, but where you can, try to prefer the first.