In regard to Matrimony it’s entirely clear cut according to every diocesan Catholic tribunal. That’s why every SSPX couple can walk in and get an annulment so easily.
I actually don’t understand why the diocesan tribunal even deals with the SSPX-married couple if the marriage sacrament was without validity in the Church. They wouldn’t deal with a civilly-married couple, would they (I have no knowledge or experience with this — correct me if wrong).