Correct me if I’m wrong, but the SSPX doesn’t “grant annulments,” but simply renders their best judgment regarding the status of marriages for their faithful (just like we do here oftentimes on CI). It has no standing; it’s just advice from priests.
Right. One of the big issues that The Nine had with SSPX was regarding their acceptance of NO annulments. Contrary popular belief, quite a few of The Nine weren't actually sedevacantists at the time. In any case, if you're a sedevacantist, then no annulments are legitimate based on the NO findings. If you're R&R, then some may be and may not be ... and this is where they render an opinion. I believe the sedevacantists accept things which are clear-cut cases, i.e. such as when a baptized Catholic got married outside the Church, or when someone attempted remarriage when one spouse was already previously married ... things that are obvious just from fact.