To my knowledge props can only be feathered by deliberate human action with dedicated controls for feathering. From the brief video it appeared left wing stalled and plane went into spin. Would indicate plane just going too slow on approach.
“From the brief video it appeared left wing stalled and plane went into spin. Would indicate plane just going too slow on approach.”
If one prop is feathered then you have asymmetrical thrust. If he was on approach he might not have enough reaction time to prevent a crash.