Hi I'm GM.
Now maybe the user was playing in a training room due to the fact he was lagging, this way he still gets to play without actually gaining anything from it, I'd do the same if my connection went terrible but I still wanted to play I'd resort to playing in training rooms.
Just to add I haven't viewed the report but you said the user was force lagging are you sure about that? I don't really get why a user would force lagg to then go and play in training room, if he was playing in main game rooms where his lagg could give him an upper advantage over others then I could understand but he wasn't.