As an "incident" we likely won't see a comprehensive investigation report.
IIRC the Aerostar had a warning system similar to the default FS one - power reduced below a threshold, below a set altitude without gear lowered will trigger a warning voice/horn.
There are reasons to have, and follow a printed checklist; to visually confirm certain required actions; to fly an approach in a way to allow required actions to be completed; and to double-check on final with the old mnemonic - GUMP (Gear Undercarriage, Mixture, Props). Since gear systems won't show gear down when up (but might show the reverse) it would hint at sloppiness, being in a rush or overconfidence. I'd wonder what his work habits are like if this was 'recreation'.
The AIN report isn't clear what airport was the point of occurrence but if it was in the Ft. Pierce (Port St. Lucie) area -- it looks like Aero Acres (FD88) -- and he then flew back to KFLL that's ~70nm in a damaged aircraft (and over a populated area on approach). Prudence might indicate a landing at a nearby field to inspect the damage, but of course then it wouldn't be near a repair shop or his own hangar.
From the video it looks like it was at a fly-in, obviously with an audience
Thank goodness he's selling.