This doesn’t appear mobile oriented, or is this an open Solaris fork?

I suppose lineageOS is the closest thing for Android tho from what I understand it is built upon AOSP

Yes, an OpenSolaris fork. I thought that was the "it" you were referring to, as that was what the parent was talking about.

There are quite a few AOSP forks, like LineageOS and GrapheneOS to cite the most famous ones, but with this change in process by Google, they will have to wait a year of no changes, then scramble when the next release of Android drops.