This statement is misleading as is evident by the top replies.

He, as many Tesla employees do, got FSD for free from Tesla. He still owns the free FSD after being fired, which as it being an employee perk already seems strange to me.

FSD beta is a closed beta only for people in the top ~1% safety scores and can be revoked for any reason (as has been done for reckless drivers). I assume another Tesla tester perk (he was employed as an FSD tester after all) is getting into the beta program regardless of your safety score. Revoking that employee-privilege after firing is not taking something he owns.

AFAIK Tesla has never taken unlocked addons such as FSD away from cars that were paid for.