The only mistake he made was asking Reddit instead of a lawyer who specializes in dealing with boneheaded corporate maneuvers. Otherwise, I wish him luck.
Put yourself in the OP's shoes. You're a college student and you get a notice like this handed to you. It's not like you have an IP lawyer on retainer or cash to run out and hire one instantly.
In fact, one helpful redditor pointed out that his college might have a law school that would be willing to help with his case as a teaching exercise. I bet the OP knew nothing about that, and that's worth the price of visiting reddit alone.