So, whether +Pirvarunas had "excommunicated" Father Crawford, that could be interpreted in different ways ...
1) formal canonical excommunication
2) informal excommunication for all intents and purposes (refusal of Sacraments)
3) admonished people verbally not to go there
Very few groups would claim to be able to do #1 ... though some might be flirting with it lately.
2 -- SSPV does this all the time, where they will in fact refuse the Sacraments to those who attend Masses of +Thuc line priests and/or CMRi priests, of or you're a "Feeneyite" ... unless, of course, you're Natalie White who could get them set up to receive Holy Orders from Bishop Alfred Mendez, at which point they'll look the other way
3 -- so?
I imagine that +Pivarunas engaged in #3, announcing his opinion that the faithful should not go there, but I can't rule out #2 for sure. Just don't know enough.