I find two things of interest. Scrubbing back from the frame showing the "prop" flying off I found a couple more frames with this object further away to the right. That along with the direct of flip and the fact that the "Motor Idling (Loose or Missing Propeller)" messages don't start until AFTER the craft has hit the ground! I think this was a (very fast) bird strike coming in from the right, which caused a tumble to the left, sending the bird (or whatever object it was) shooting up. This caused the crash, the broken propeller, and the subsequent error messages.
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View attachment 82427 If that is a prop, it is a very big prop.
And it appears his props are the standard DJI white, not dark like the object above.
If I missed something here, please let me know. I would like to get this figured out correctly.