You can now remove a user’s penalty history via their admin page. By doing it, the logs will be changed from “suspend user” to “suspend user (removed)”, etc, and that will allow them to reach TL3. You can do this for any user you’ve previously penalized and whom you’d like to reach TL3.
https://github.com/discourse/discourse/commit/4195c7c9ea1117bef9c3362eb38d818f8303419e