One possibility is that Journet and Centi are simply wrong, and the Church does not supply jurisdiction to the Orthodox (but then it becomes difficult to make sense of the "indications of jurisdiction" noted by Centi (i.e., no general confession or convalidation of marriages required upon reunification with Rome).
On the other hand, presuming the SSPX has not been covertly reconciled to modernist Rome, do we not have in that strange relationship not merely a tacit and supplied jurisdiction for sacraments, but an explicit jurisdiction (e.g., confessions) to a community allegedly in schism? And was not the reason adduced by Francis precisely the same as that mentioned by Journet and Centi (i.e., so that souls may be provided for), regardless of any additional motives, such as drawing the SSPX into conciliarism?