Earlier quoted context omitted.
Yeah... Also, the unbanning of users previously considered hateful also directly conflicts with "to keep the platform safe from hateful conduct"
Remember way back before the era of social media mob justice, when there was this concept of 'forgiveness'? At least some of the banned deserve a second chance. Those who were total monsters will probably be quickly re-banned. Others have found their own echo chambers elsewhere and won't even bother coming back.
Which is basically what you described and therefore is already how it works.