I think you are grasping at straws to be angry at something. Nowhere did the author blame Valve for banning him, and he jokingly mentioned that Esc dismissed the message instead of clicking OK. In his update, he even asked to be mocked for getting banned since he exposed himself by doing his job.

Asking not to do something in a popup is not binding in any way, shape or form, it’s just friendly asking, no matter if you click Esc or OK or any other key.