I'm pretty sure you can spoof your IP address if you know what you're doing. It's a little over my head. I used to have an email client that just permitted it, but I think I was running Linux then. That was just email, though.
Maybe he could go through an anonymizer. Those are set up exactly so your IP address can't be stored and tracked by the predators like Google, Apple, and Facebook who want to sell your private data. You log into the anonymizer and then everything goes out from them. Of course, MLB might know who the anonymizers are and just block all of them.
Getting a new computer will only change his hardware address, but not his IP address. I'm doubtful that MLB tracks the hardware addresses because they recognize us just the same regardless of which machine we're using. If they're watching for an IP address he might be able to ask his ISP just to put him in a different address block. Or I suppose he could just change his ISP and he'd for sure get a different IP address. Send this note to him if you're in contact with him.
I thought there was a time limit on bans. Surely he's out of jail by now.
Crosley