Not quite. I think it’s unlikely the court will ever invalidate an amendment/proposed amendment because of its substance, because my opinion is that the only valid challenge to substance is the Senate entrenchment clause and I think such an amendment is unlikely to be proposed.
As for ruling on the substance of amendment proposals prior to ratification, if a State is not harmed by the proposal itself I doubt whether it could even reach the Court.
Cannot rule an amendment proposal unconstitutional because of its substance, with the single exception I mentioned. I have no qualms with the Court upholding a proposal when challenged on the basis of its substance - with the one exception.
No, it is my opinion.
~Max