Obviously it can't be the case that any form of mobilization is equivalent to fascism. Societies mobilize all the time. According to Payne, fascism has a consistent goal of creating a new nationalist authoritarian state, with not simply a mobilization but a militarization of the populace --- a "mass party militia".

There's a kind of "horseshoe theory of politics" thing that happens with observations about Soviet communism and Italian fascism. Both systems are bad, and they share specific bad characteristics. But they are not the same; in fact, they're antithetical to each other.

I think the Green New Deal is poorly specified and ill-advised, but it is not Soviet communism and certainly not fascistic, and AOC is not a "charismatic authoritarian" in the fascist sense. It was a silly comparison to have made.