I have a Youtube channel with restored NASA documentaries and footage and I can tell you that the content matching algorithms work. Even with 50 year old music or images, you get copyright claims.
The process is automated, so the Mouse knows about it and can block any videos by pressing a button.
They know about everything, since they have people googling for their property 24/7.
I’m sure they will act once it’s released ( give him rope to hang himself) 😉