He can get a lawyer, but it would be extremely unusual for any judge to reinstate him in an academic job. Normally judges are willing to reward financial compensation to faculty who dispute being let go, but not to force universities to rehire them.
The presumption is that judges should not second-guess academic authorities as to who is qualified to teach.
Typical compensation might be a year's pay, if the judge feels there has been some injustice. Nothing like the kind of money that has been talked about.
Of course with the loony judges we have now, you can't be sure what they might do.
LOL! You've got that right!