He's default trust so if he was hacked Theymos would know about it. Looks like he negged you for Netflix account scams so maybe you scammed his alt or a friend of his?
Like he said I'm sure it's an alt of someone that got the bad end of the stick by one of your netflix deals. I know a few members that have alt DT accounts that they don't use other than for purposes like that. Try contacting the guy that claims you scammed him and resolve it and I am sure he will remove his feedback.