That's approximately the same sort of operation as stealing the engine of a car. Not something you can do in a couple minutes with a battery powered angle grinder.
Since the batteries cost an order of magnitude more than a catalytic converter, this could justify criminals developing more sophisticated equipment to pull it off.
https://www.tesla.com/videos/battery-swap-event
Since the batteries cost an order of magnitude more than a catalytic converter, this could justify criminals developing more sophisticated equipment to pull it off.