Well played
Correct, in general.
Pistols with full length grips, or with front-facing magazine detents (HK P30, VP9, USP etc. for example) and Glocks (mags are notched to clear the ejector) are relatively immune to this sort of thing. Anything that you can physically override the mag lock on could smash the ejector. You could in theory hammer a SIG P226 mag into a P229 and have this happen, but as mentioned, much less likely with the strong carbon steel ejector of the 229.
The 320 series ejectors are simply a spur machined into the (relatively soft) stainless steel FCU frame, which is stainless steel and not replaceable. The same modularity that is a strength of the system leads to this well known weakness when running a too-short grip module with a too-long magazine at slide lock. When the pistol slide is in battery, it rides directly on top of the ejector with zero clearance and provides support.