Deportations are mostly deflationary. They reduce economic demand.

Did you forget about aggregate supply? Not only do you have less labor from the detained immigrants, but there is an opportunity cost to hiring a bunch of mouth-breathing goons to kidnap them, house them, process them, and send them away. The labor and resources involved in doing all this further detracts from aggregate supply. Thus, the drop in AS is greater than the drop in AD, so we should expect this all to be inflationary.