I'd say that Jane Street would seem to be less hierarchical than others and thus more closely aligned to an anarchist collaborative.

(It's all relative, I suppose. Bernie is a "leftist" in the US and would probably be a centrist in Scandinavia)

Was it an intentional rhetorical device to brush past the important distinction?

Yes, there will always be more powerful cliques. This is Jo Freeman's The Tyranny of Structurelessness. But the point is specifically whether those cliques and hierarchies are encoded into formal committees or whether they remain fluid based on the desires of the group at any given moment.

If we avoid codifying the hierarchies, we get better distribution of information and resources, people are held responsible to those who delegated tasks to them, and responsibility can be rotated more freely.