I think that there is some confusion here between not having a canonical place in the Church and the legitimacy of the mass celebrated by an SSPX priest.
Let’s see if I can help.
The deacons, priests and bishops of the SSPX are validly ordained. Therefore, they can validly celebrate the mass.
A mass, whether it’s celebrated by a priest who is in ordinary standing with one of the Apostolic Churches or one whose situation is irregular remains a Catholic mass. There is not such thing as a mass that is not catholic w/a lower case C. If it’s valid, it’s catholic.
Because the priests of the SSPX are suspended they illegally celebrate the mass. We call that illicit. A priest who is suspended is not supposed to celebrate any sacrament except for absolution in case of emergency.
The authorities have made it clear that attending mass celebrated by a priest or bishop of the SSPX for the purpose of fulfilling one’s Sunday obligation is allowed. However, it is discouraged. Discouraged is not the same as forbidden.
The authorities have also said that one may not encourage or support the separation between the SSPX and the Vatican. You shouldn’t be attending an SSPX mass because you’re on “their side”, observe quotation marks.
Reason tells us that if one has access to a mass that is valid AND licit, one does not drive past that church to attend a mass that one knows is illicit. In essence, if one does this, then one is implying support for disobedience.
It does fulfill one’s Sunday obligation. However, one must ask oneself why one chooses to attend mass at an SSPX chapel. There has to be a legitimate reason for attending a mass that is celebrated illegally.
Fraternally,
Br. JR, OSF