That’s certainly true. The install base for PS4 was very large, and even though some of those gamers will have moved on to PS5, there is still a significant number of customers on the PS4.
In a way this is beneficial for Apple, since the PS4 is roughly equivalent in graphical power to the M1. It makes porting to the lower-powered platform easier in general, and porting to M-series Macs with unified memory is more like porting to a console anyway.
It is still an uphill battle getting games made for the Mac. The market is less of a gamers market, in terms of total M-series machines it is a smaller market than say the Nintendo Switch, and there are significant engineering difficulties moving rendering engines to Objective-C and Metal.
I reckon there will be some lean years until there are something like 80 million M-series Macs out there, which may happen with the M4 or M5, and then the number of ports will pick up.