“Related to” does not mean that they are the literally same thing. They are clearly related as a suite of applications which form the core experience of what is called “Android”.
The law doesn’t say that if it is technically possible to unbundle a set of options from a product offering to be sold al la carte that companies must do that.
These are all essential components of one product — a mobile OS. Mixing and matching, for the vast majority of users, is neither practical or expected, and absolutely negatively impacts the brand.