I anticipate that I may regret this…
Are you saying that the propeller wasn’t rotating at all or sufficiently before the landing, and that it’s necessary for the propeller to be rotating in order to allow the undercarriage to be extended?
When I see an aircraft ‘wheels up’ with little-to-no damage to the propeller, I wonder whether it’s had an engine failure and the pilot’s landed as quickly as possible while concentrating on things more important than the wheels. Are you saying that absent propellor rotation, the wheels can't be extended on this kind of aicraft? If that's correct, I'd suggest the pilot didn't 'forget' to extend the wheels.