When theymos said it's "handled case-by-case" I do think he only meant deserving people to be given a second chance in the forum. From what I know ChiBitCTy was one of the recent members who got unbanned from plagiarism and using him to compare markiz73's contributions to the forum you will see that he doesn't compare to ChiBitCTy in a way theymos would reconsider him back in the forum. For one ChiBitCTy has a lot of Trusted Feedback associated with transactions in the forum compared to 1 Untrusted Feedback markiz73 has. His contributions are only limited to topics related to mining in the Russian board and some announecments on new mining equipment while ChiBitCTy on the other hand have organized charity events and even though he got banned from posting he still is active in the forum reading topics and chatting members through chat groups consisting of forum members while markiz73 on the other hand shows that he hasn't been active in the forum since the day he was banned. Using ChiBitCTy's situation as an example I don't think that markiz73 is qualified to be unbanned in the forum but it's really up to theymos to decide on his case.

You can see the ChiBitCTy's ban appeal thread here

By the way for people who are wondering his unban conditions also comes with a signature ban. Just go to his profile and you will see his sig section saying "Banned from displaying signatures until March 09, 2020, 08:24:44 PM" so if you just want to unban him for him to join signature campaigns you need to consider this one.