PWCToday lets members post negative feedback on people that they haven't personally done business with. So you get a lot of threads that are about shady sellers even though the thread participants have not actually had a transaction happen with that seller. This is a very popular practice over there and has been for years. I'm not commenting on it being good or bad, it's just the way it is. (As a side note, we do not allow it here)
The reason people are giving you
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in that thread is pretty simple: you come across as defending a guy that is well known for very shady eBay practices, being a pain in the azz to deal with (online), and ridiculous prices. For at least half a decade now. This is pretty well documented by buyers and ebay feedback.
I have heard from a couple of people that Mark's a decent guy. I don't know, I've never interacted with him.
You have a valid point about that delagem never having done business with that seller, but you might as well be trying to defend a child molester to a bunch of mommies. You're not going to win.