It's simply a fork of LineageOS designed to run microG out of the box, the builds are there for ease of use. microG is still a separate project from LineageOS.

It's simply a fork of LineageOS designed to run microG out of the box, the builds are there for ease of use. microG is still a separate project from LineageOS. They are "LineageOS [builds meant] for [use with] microG".