1. er war bereits beim Durchstarten, als der Body den Boden berührte (die Tonspur des Videos sagt etwas anderes)

2. das ANR-Headset verhinderte, dass er die Berührung des Bodens durch die Props hörte

3. Checklisten helfen...

"My entire focus was upon landing technique, carrying higher power setting than usual on approach, which prevented operation of gear-up alarm until power was reduced for landing about 10 ft over runway. At this ht, gear-up alarm sounded and go around was executed immediately. Uneventful gear down landing then executed. On engine shutdown in hangar, symmetric bi-lateral propeller tip damage noted. Noise-canceling headset had precluded pilot awareness of runway propeller tip contact during go around. My lesson has been that the employment of the written checklist in all phases of flight in both familiar and unfamiliar aircraft is mandatory."

https://www.37000feet.com/report/605935/Aerostar-600-pilot-damages-propeller-tips-on-go-around-from-gear-up