Moving pages while a user is renamed should not result in "new messages" alerts on every wiki as a result of moving user talk pages
A potential way to suppress these alerts is to store the state of a user's notifications, perform the moves, and then restore the notifications to their prior state. Alternatively, as optional parameter can be added to the moves to suppress alerts (similar to nominornewtalk)
If the intention of these new messages is to inform the user they have been renamed, then a separate custom message should be used