https://www.dancarlin.com/product/hardcore-history-wrath-of-...
https://www.dancarlin.com/product/hardcore-history-wrath-of-...
The second red flag is that I searched for "kings and generals" on the r/askhistorians subreddit. I found only a few reviews of it and they weren't great. r/askhistorians tends to be quite critical of popular or simplified history, a little too much for my taste, so I don't mean to give their reviews too much weight. But from what I could see, it was Not Good.
Mind you, these are red flags. It doesn't mean all of the videos made by Kings and Generals are bad or completely false. But it's enough for me to not even bother watching them at all until something convinces me otherwise.