Staff can see everything you do on your controller. Every input is recorded with its exact timing. Staff can replay it moment by moment, in step with match video, and every recording is checked again whenever the checks improve, so something that looks fine today can still be flagged later.

Recorded: your controller's inputs, which controller it is and a few facts about this browser, with your Discord name. Nothing else. Kept for 30 days in case of a dispute, or longer while staff review it; the league may keep copies to improve its checks.