As you suggest, the wording should be clarified to say that the key is never copied, is only stored on your device, is not accessible to others, etc.
It does say
> It’s protected with the new key which is controlled solely by the user’s trusted devices
I think main thing they’re avoiding is an explicit guarantee that the key cannot be retrieved from your phone by a third party.
Maybe they are unable to make that clarification, if it would be false.
It does say
> It’s protected with the new key which is controlled solely by the user’s trusted devices
I think main thing they’re avoiding is an explicit guarantee that the key cannot be retrieved from your phone by a third party.