Deforming the loop or catch or whatever it's officially called? Yes, that's a possibility. I was more concerned about the possibility of pulling out the screws or rivets or spot welds holding that piece to the door jamb.
The site says 310 lbs weight limit, but that's for their device. What's the limit for the part on the vehicle? I mean, it's supposed to keep the door closed in an accident, which can be very high forces, but this is stress/force in a different direction. I don't know. It's a creative idea, but I don't know if I'd use one.