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I think this behavior hasn’t changed: https://developer.apple.com/forums/thread/36442

Everything in this space is so muddled. Deleting the last app from a vendor should erase that data. On the other hand, if you restore your phone from another device, that should never require relogging into anything.

I used to go out of my way to take encrypted iTunes backups because it restored app state perfectly.

After some iOS release though, every app started doing "new phone, who dis" regardless of the restoration strategy, so I stopped wasting my time.

Yeah, last I checked, encrypted itunes backups would keep the "this device only" keychain data. Which would only work when restored to the same device - it needs the UID key from the secure enclave to decode. (I wrote code a few years ago to decrypt the rest of the keychain.)

At one point, google authenticator started marking its entries as "this device only". I don't know if they've backed off on that since then.

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