You could say 'what every justice system in moden democratic countries thinks'

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I didnt think I would really have to start elaborating about objectivity (seems to me that you are a little naive there) and the reason why its usually handled that way (independant second party) in short: its a basic human right for a reason.
NOT saying nostalrius HAS to do anything, they can do whatever they want with their players and server, hence its a suggestion. But frankly, whats the point of even appealing if you wont be reviewed by a higher in hierarchie or at least different person. Why would the same guy come to a different conclusion, be completely unibased, admit previous mistakes and by all means be totally objective.
You may say that its not doable and wont happen due to staff limitations, slim ressources or all sort of arguments, but if you claim that the previous investigator is the most familiar with the specific case and should therefore review it, you simply misunderstood what it means to 'review' something.
Cheers