Yes, the rebuilder should have inspected the inlet, as cleaning the threads is normally part of the procedure.

My carb had not been previously repaired, but it was cross threaded when I bought the car and seeped a bit. After a couple R & Rs it leaked noticeably. So in it went, and a helicoil repaired it. The steel threads are considerably stronger than the original casting.

If one of the oversize kits was used then the helicoil repair may not be an option.