Very interesting. Thanks for digging that out. From a quick code review, it seems that RecoveryKeystore is exposed from ILockSettings AIDL with only consumer being RecoveryController that is used from GMS. So it's essentially GPlay only secrets/keys and not app or system.
Android Recoverable Keystore LT slideshttps://www.slideshare.net/NikolayElenkov/android-recoverable-keystore-205791027 …
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Everything else appears to use the old fashioned HW-backed Keystore. So I'm guessing it's some form of GPlay data backups that bind with device pin aiming to improve device migration experience and recover more user data "without" compromising privacy.
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