That article says that from Android 6-12 if an app wanted to scan for bluetooth it ALSO had to require the location permission. Not that BT had hidden location information. As of Android 12 apps could bluetooth scan without requesting/enabling location.
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That's what the person you're replying to said as well. In order to use Bluetooth, their app had to request a location permission from the user. If they wrote an app targeting a version of Android before that range, the permission would be requested for them even if their code didn't explicitly request it. If they targeted a version in that range, they would have to request the permission at build time.