Just keep a little translation book in your head for modern speak; for example at this point "toxic" simply means "something I don't like", "literally" means figuratively, etc.

It’s a leftist shibboleth.

Greed, self-interest, and selfishness were invented by Adam Smith, duh.

In actuality I've seen internet communists regularly call clearcut examples of feudalism, mercantilism, and several other economic systems "capitalist." It often feels like they're not aware of any possible economic systems outside of capitalism and communism.