You can have multiple accounts on one IP. Plenty of people have throwaway accounts. Entire
nations would be blocked due to CGNAT if it worked the way you suggest. They're looking at more than your IP address though (my guess is ip+useragent at the very least; the API rate-limited by useragent).
Your problem is that one of the heads of your hydra caught a ban, after which point everything you do is assumed to be malicious. Given the political nature of what you were banned for, there is no doubt in my mind this is intentional. It's not an overt act of discrimination if they just don't answer the phone after "accidentally" locking you out.
For your own sake, move on. Reddit isn't worth fighting for. It's just a bunch of schoolyard bullies squatting on the playground equipment, throwing rocks at everyone and crying victim. If you're not a member of a protected class (or pretending to be), they don't want you there.
