Yuri is describing a very real process

Yes exactly. I never got from people sharing Yuri's videos that they meant "it's the Russians" - on the contrary, I took it to be a factual explanation of the methods of subversion which are being used by communists today. Much like an old video explaining how a magic trick works, we can apply the knowledge of the trick even if it's a new performer - even if it's the old magician's son.