The point he was making is that a cultural distinction is not a sufficient to consider it its own class.

That's not a claim anyone was making.

The PMC is a well defined concept, wether you consider it a class or not. CTH and their guests are taking this predefined group and analyzing the culture that manifests among these people.

The economic makeup, the relationship to the means of production, wether it is a separate class, is not the subject of the podcast episode, it's not being seriously addressed by the tweets, and OP isn't even engaging with it. He's just completely dismissive of any term he hasn't seen in a Karl Marx quote.