According to the posted link, the network can be turned off entirely if you wish, and you could just not use Google Play Services on your device, and that should also stop this.
It appears to require a Google account to do the tracking. So yeah, without Google services, you should be perfectly safe. Since you have no Google account registered on device and no services that run rogue in the background,
The article did not say specifically how it was getting added to Android 15, because if it's in AOSP, then yeah, there's definitely a problem. But if it's in Google Play Services, which seems likely, then it would not be as big of an issue.
While I like those options, they are definitely not for everyone.
Those problems are collective, protecting the privacy of 1% of the population is as good as protecting nobody.
I think a growing number of "normal" people do, they are just less willing to make sacrifices for it than the types of people who populate this community, for example.