See the original description at the top on how Lr would handle the device-captured depth:
"Lens blur applies a depth-based blur effect, similar to what can be achieved with real-world optical lenses, by using AI-generated or device-captured depth data (when available)."
When the device-captured depth data is avaialable, Lr would use it by default, unless you overrride it to use AI generated one by Lr via options in the "..." menu in the UI.
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