Violation of [1004.4.1] - Permanently banned players in a scrimmage on an alternate account (3x) and [1004.4] - Using a banned player in a scrimmage on an alternate account. After the minimum 8-week has elapsed, the player can appeal to have their ban lifted, provided they can show that they've changed as a player and how they interact in the community.
Each list published its own bans, and every reason is in its words. Mizan copies other lists' bans as published and enforces none of them; its own anti-cheat for Garry's Mod servers judges players separately. Think a ban is wrong?