It’s a case of extending the precedent. Had Pope Francis argued that in the spirit of mercy, he would overlook the disobedience of SSPX or something like that, your argument would carry. Rather Pope Francis confirmed the raison d’etre of SSPX. Any relation to with the Year of Mercy seems to have more to do with fostering understanding and tolerance and less to do with permitting something illicit.
No, that is not correct as there are formalities in play that we are not considering. Formally, a priest has to have the faculty for performing an absolution from a bishop that is in authority. That is not the case with the SSPX.