Pshischia was in some ways similar FWIU
in terms of intentional mystery maybe,
you not understanding their shtick does not antinomianism make either.
but I don't know enough about their history to address specific details of specific incidents. I believe we have some Gerrer (and possibly other) chassidim here who may be more familiar.
but in any case your claim falls apart at the timeline?
didn't the 'mysteriousnes' in Pshischa start years after the intense antagonism from Vilna? who could they take that credit?
(besides, isn't pshicscha is usually considered the 'good' chasidim, the ones who you'll admit new how to learn?)