I’ve just re-read the CFR and have changed my mind, as I missed the generic criterion while concentrating on specific ones. It says any aircraft accident needs to be immediately reported, and defines an accident as:
...an occurrence associated with the operation of an aircraft which takes place between the time any person boards the aircraft with the intention of flight and all such persons have disembarked, and in which any person suffers death or serious injury, or in which the aircraft receives substantial damage. For purposes of this part, the definition of aircraft accident includes unmanned aircraft accident, as defined herein.
It certainly looks like substantial damage to the wing, so unless I’m interpreting it wrongly (not impossible as I’ve already done just that) there should have been a notification filed to the NTSB, unless anyone knows to the contrary?