You cannot truthfully say they are positively invalid as if you actually know, because you don't actually know, because it is impossible to actually know that all NO sacraments are invalid.
No one can say they are postively invalid or positively valid. This is the issue - doubt.
But Pax, even a prot baptism cannot be said to be automatically invalid. Automatically illicit, yes. Automatically sinful, yes. Same goes for ordinations, even when done by schismatics. Also, defending the sacraments is not new, it is a Church tradition, a tradition that only the Church will forever remain faithful to.
If there is reason to doubt - and there is, since new-rome's new rites are systematically ambiguous - then conditional ordination is necessary. One is not allowed to attend a doubtful mass or sacrament under pain of grave sin, per Canon Law. Therefore, one is not allowed to attend a TLM by a doubtful priest, under pain of sin.
PM me the SSPX chapel location and priest's name, I will look it up and call them and ask for you if he's been conditionally ordained - and if not, why not.
This is a very charitable thing for you to do, but it's the sspx's fault that you have to do so. This information should be publically posted for all to see. Every catholic should demand to know that their priests are valid - with 100% certainty. The fact that the sspx is scared to question new-rome's sacraments is a symptom of their political games and their lukewarm defense of Tradition.