Youtube’s claims are that the channel violates “sensitive events” or “violence” themes, which I don’t really take at face value. Especially with all the actual gore promoting content of youtube this was an presentation vlog, without claiming any specific accuracy. Most likely it was maliciously flagged for presenting the simplistic methodologies of said agencies. Presenting agency methodology is absolutely free speech and has been a target of random and sometimes unrelated harassment and legal actions for many years in many cases (stop and frisk, polygraph pseudoscience, racial profiling, journalist harassment in general etc)