I’ve been in the open source software world for multiple decades. I am well aware of the gpl and what it has to say about derivative works.
You seem a little confused however, though I feel like you are just desperately trying to wrangle an angle where you can totes win and you were never wrong. It’s really annoying to get into a conversation online like that.
Anyway, incase anyone else gets here, this guy is just endlessly wrong. Ignore.