Holy shit, this article is garbage... the base premise that Play Services can access anything is true, but so many bad claims.
Google Play Services is a system app on phones that ship with Google services, and is the case on the author's phone too, since he could only disable the app, not delete it. System apps can still be updated separately from the system, if their signature matches the updated version's signature.
Also, I don't think they dedicate enough time to describe just how much data Google gets through your device, like how it logs your location for Google Maps' business popular times indicators and traffic metrics, or how they use all of your data to give you hyper-targeted advertising.
As for microG, it also runs with elevated permissions on most custom ROMs, and for some features (eg. integrity checks) it downloads & runs Google-made programs (eg. DroidGuard) with strong privileges. DivestOS (now discontinued) used to run microG in a sandbox.
There are ways to run Play Services as a normal app if the custom ROM has a compatibility layer for it, like GrapheneOS, where you can selectively enable permissions for Play Services. Of course, if you refuse some permissions, some features will break (eg. refuse SMS/call access and RCS will break), but it's a mostly usable situation.
