Staff, or at least the lower ranked staff like mods and mods +, truly mean well and want to help the server as much as possible by moderating chat, banning hackers, and sorting through the dozens of appeals that are opened at a time. They do not create or adapt the rules, they can only enforce them, and they have very little sway on changing the rules if something doesn't line up or is outdated.
I agree with OP, although I don't have all of the context of his ban: the original screenshot posted in his first image is obviously not proof of anything; but other than that I can't speak to this specific appeal. My personal opinion is that anyone who's been banned for 2 years or more should be unbanned if they take the time to make an appeal, but this is not the rule nor the view of the higher staff members who make the rules.
Its important to recognize who is making the decisions here, and not to blame the mod who may have banned you originally or who is handling your appeal or who offered to speak to you on Discord about it. Like I said, they don't make the rules and their goal is to help the server, since 95% of the time the rules make sense and are worth enforcing and following. Mods want to be regarded well by their superiors, they want to be known as good staff, they want to be promoted, and they want to make Manacube a better place. It's not their responsibility nor anywhere near their ability to question the rules they're enforcing, or to make exceptions to the rules when it obviously makes sense to. Manacube's hierarchy has serious issues, but inflating the abilities of teenage volunteers doesn't help.
I hope you get unbanned eventually, because at the end of the day Manacube is a server worth being able to play on, whether you choose to or not.