"possibly roping the Supreme Court into the legal proceedings"
Step carefully there. SCOTUS decisions have, of late, reserved some surprises.
As for the complaint, I feel there is some ground in it. A competent US citizen did not get the job some H-1B holder got. Sure, the competence of the H-1B holder is not put into question, but the chance that he also has decades of experience for that specific job offer seems kind of slim to me.
Whatever the outcome, I'm not expecting this affair to do anything to Meta's hiring practices. Not until there's a federal law that states that US companies are required to hire US citizens competent for the job before looking to bring in foreigners.
And that will never happen for many (lobbying) reasons.