Where does it say that it's a 2 day suspension?
These are the only rules regarding leaving TNWL reg to join another TNWL reg
-Subrules #1. A player from a eliminated regiment can not join a regiment that is still in the tournament.
#2. A player who is part of a regiment that is currently in an active group stage or a player who wants to join a regiment in an active group stage(their group is playing this week) can not join any other regiment or apply to do so.