A fine reasoning, if that were in any way the discussion at hand.
The legality or illegality of abortion is immaterial here. The case in question is about privacy, but specifically we’re talking about whether the Federal government can interpret the Montana state constitution (they can).
My “I could see…” was a reference to a reinterpretation of laws/precedent/whatever by the SCOTUS to overrule the state Supreme Court decision. We’ve seen a number of questionable rulings from this SCOTUS, and I would not doubt they would find any justification to legislate from the bench on what seems to be a pet cause of the majority.