and Auth Left is even more theory than communism is
Uhhh... what??
I'm gonna take a stab in the dark and say that they meant "even more theoretical than communism is" which doesn't make a ton more sense because when you're talking about political theory then saying something is more theory/theoretical can mean that it's more theory-heavy. I'm going to assume that they mean to say "hypothetical" though this is taking two more leaps than I would want to or need to if the commenter was a bit perspicuous in their phrasing.
The thing is, speaking as a long-term anarchist recently turned ML, it's a bit galling to accuse the "auth" left of being hypothetical given that if anything the lib left has much less in the way of real-world examples to hang their collective hat on. And on top of that, the lib left political projects that are generally pointed at as being exemplars of lib left values fall far short of their touted values, to the point that I struggle to understand how they can be upheld as positive examples at all, or otherwise they point to examples which reject labels like "libertarian left" or ones which have virtually no historical scholarship existing in the anglophone world to speak of.
Edit: Oh no...
I'm no Marx scholar but I'm pretty sure that Marx's critique of the Paris Commune must have centered around needing more unions, right? Right?