Are the Google Mobile Services the same as on the Gemini? If so, was there ever any real doubt about them?
I think this has more to do with formal approvals, rather than anything related to actual functionality.
Back on Nougat, my Gemini used to say, somewhere in the About phone section of the settings, something akin to not being approved for Google services, yet they worked just fine all along. Currently, on Oreo, my Gemini, claims to have a serial number of 0123456789ABCDEF, which, obviously, is inaccurate, be it in a, mostly, irrelevant way. As a nerd or geek, I can live with that.
However, as the Cosmo, reasonably, aspires to be a "real", if fairly niche, mainstream product, rather than the pioneering device, for the specially interested, that is the Gemini, Planet Computers reasonably has to get from "well, it works" to "it works well", as selling a device complaining about not being properly licensed or showing a serial number, suggesting the device might have been hacked, or something, probably wouldn't be very well received among a more general population.