While he does seem genuinely repentant in what he has done, it doesn't excuse the fact that he had (supposedly) broken a multitude of rules. However, be that as it may, if these instances of rule breaking revolve around him being on the Blue side, then I don't see why the permanent Server Ban being lifted isn't being considered at the least while the team ban remains effective.
Though, even provided the aforementioned information, it may be completely irrelevant as it's somewhat apparent that the main reason he's Server banned is his attitude/behaviour, which I personally cannot vouch for or against as I am not familiar with the whole ordeal.
That all being said, it should be noted that the player is trying their best to plead their case here. Whether or not it's genuine is a whole other story, but it's unfair to completely rule out the possibility that he has in fact changed. The replies have been nothing but civilized and respectful from him and I don't see why he is being treated so poorly in this Ban Protest, even given his past history. Troll or not, the worst that can happen if he is unbanned (Server, not Team) is that he will harass people again, in which case all you would have to do is permanently ban him from the Servers again and be done with it once and for all. At this point, it really just looks like Staff are hung up on his past actions and refuse to give a second chance because of some personal vendetta.
@Sgt.Xranth while it may be similar to the Ban Protest you linked in your original post, the context of the bans are no where near the same. On one hand, the other player mass freekilled and fled (with no history [that I'm aware of] in terms of general attitude/behaviour) while you have been accused of denying LR and mass freekilling afterwards; abusing hide and seek mid round; disrespect; evading a ban with alternate accounts; and other counts of general rule breaking. Some people are more likely to receive a second chance depending on their history with Xeno Gamers, while others aren't so lucky (though I honestly don't condone unbanning those who intentionally mass freekill to begin with).
Mind you, this is all just personal opinion from a neutral party who has nothing to go on besides the information provided from threads that relate to this player and his ban history. I do not play in the TF2 Division, and with that being said I won't leave a vouch on whether or not the player should remain Server/Team banned. I'll only provide my input and opinion on the whole situation, as I do with other threads before this one and hope that Staff take a careful consideration to both sides without any sort of biased nature.