Given how APS-C(not just for Canon but also Sony*) is unwanted step child not surprised that choice of word for lazy low effort mount conversion if it is indeed EF-M lens being adopted over to RF-S.
*Sony does have decent lens selection which hasnt been updated since FF take front seat even crop cameras are quite bad compared their own FF cameras.
Not sure I'd characterize it that way. Given that APS-C bodies outsell FF bodies by ~4:1, it's a market segment very much wanted. For the big three (Canon, Sony, Nikon), APS-C comprises the entry-level segment and the intent is inexpensive bodies and lenses aimed at people who may buy an ILC with the kit lens(es) and that's all. So the segment gets the effort warranted to meet the need – modest bodies, nothing really fancy in terms of lenses. Of course, there is a small fraction of people who will expand their system...for those people, the APS-C offerings remain limited (EF-S 17-55/2.8, EF-M 32/1.4) because the real goal is to push them to FF.
Fuji has taken a different approach, building a high end (relatively) APS-C system. But they've remained a niche player, which is really down to the segment and not their system. Note that they've also added MF to try and capture that higher end in a way that does not force them to compete with the big three.
