

Fused Location Provider data sent to Google is anonymized with a temporary device id anyway. They also can’t tell if you needed location for this, maps, or Pokémon Go. But they do sometimes collect GPS, WiFi, and cell data. Not using it is more private but I don’t think it’s worth worrying about.
The point they’re trying to make is that while Apple location collects anonymized data, the app itself could collect that data and send it off with a unique identifier. Like Strava except it’s spyware. It has location and internet permissions, and the App Store data privacy thing is self reported and not necessarily factual. We can’t know unless we dissect the app because it’s not open source. Right now it seems they’re not doing that, but nothing is stopping them.
Android’s Fused Location Provider, even though it’s provided by Google Play Services, works in the same way and is just as private as Apple’s location API. They are both on device with anonymized data sent back. So IDK what the devs are talking about. But I am interested in their blog post.