Bro, this happened last summer.
Blizzard literally allowed him to enter their team as a filler just to say "We're going to hinder you and ban him for four games.".
Here's how it works - Blizzard is looking to find anything that could come back on them (hurr durr blizzard why are you ALLOWING THIS?!?!) And taking care of it before anyone else can call them out. It's called being professional and understanding that a LOT of money is in the OWL - Who the fuck wants to even risk jeapordizing that?
Everyone knew that he boosted players last summer, so why the fuck was he allowed to even enter the OWL just to get suspended? OWL is full of SJWs and idiots.