The setup for this - the clause saying that if you didn't sign an exit agreement within sixty days the company would reclaim your equity - was in the equity plan and grant documents: https://x.com/KelseyTuoc/status/1791584341669396560
Not a lawyer, but "general release of claims" seems like a term of art which I would expect to be a something that would waive your right to sue, and not an agreement that includes a non-disparagement clause.