I think there is likely some western chauvinism element to a lot of newer leftists that are not in favor of multipolarity. The propaganda doesn’t wash away from the mind so quickly for many. So they have a tendency to think Actual Existing Socialist states are not valid in some way because they have not learned anything beyond the propaganda.

In their minds, this would make multipolarity messy. Better to have a global authority to keep order. And yet they call those in favor of multipolarity authoritarians.