Pilot did an excellent landing.

If you look VERY carefully a ring came off wheel before the “tyre” followed suite. I guess it was some retaining ring.

My guess pilot tried to set down as gently as possible (and he did, feather touch), but when the load settled on flat it collapsed and caused huge drag that tipped nose over. Pilot was spot on to keep her on the centerline, excellent control!

Prop strike requires engine tare-down in US (FAA and Insurance), but I think engine is 100% OK, the propeller hub will need careful inspection to be safe, though.