You will notice, before belief part it says "Due largely to the factors mentioned in this topic", and I don't see you substantiating any risk of theft. I do however see you making lots of claims based on his opinions, which is explicitly prohibited.
The flag doesn't say anything about risk of
theft. We can play word games all day long. I believe the presented facts point to Quickseller's intent to cause harm in retaliation to Hhampuz. You don't. Sounds like an excellent case to oppose.
You play all the semantic games you like. I still don't see any evidence of him losing anyone money, or him engaging in trade activity that would result in that.
"suchmoon alleges: Due largely to the factors mentioned in this topic, I believe that anyone dealing with Quickseller is at a high risk of losing money, and guests would be well-advised to avoid doing so. This determination is based on concrete red flags which any knowledgeable & reasonable forum user should agree with, and it is not based on the user's opinions."
I would also oppose a flag on Hhampuz based on the evidence I have seen so far. He has a right to make poorly formed accusations. You don't have a right to punish him for it.