I’m not so sure this is so. For those just tuning in the PNCC has absolutely nothing to do with the Nation of Poland, nor are they in communion with the actual catholic church (unless I missed some serious news!). They are an American invention formed when Polish immigrant communities here got tired of being pushed around by Irish-dominated local bishops and committed schism.
Back to the above quote. The schism included at least one valid bishop, so the PNCC probably retains apostolic succession (I’m not qualified to decide!). In that sense, I think that catholics may partake of communion or confession from PNCC priests in case of emergency or danger of death, but are not supposed to ordinarily commune together. Communion, after all is supposed to reflect COMMUNION. It’s nearly absurd to pretend to be communing together when we are separated by schism.