He "grants" it now and for the "Holy Year of Mercy", which implies that the SSPX priests did not have this power before. By the way, what about the SSPX marriages now, according to the Vatican?
Technically, and from their standpoint, the SSPX did not have this power before, since valid Confessions require jurisdiction except in danger of death. SSPX simply argues that this supplied jurisdiction applies because of the state of emergency, which obviously Francis doesn't believe exists.