>>4652068 (lb)
https://www.webmd.com/drugs/2/drug-57261/trim-tab-oral/details
It is also a small flap device on the control surfaces of aircraft used to trim or maintain a straight level flight.
Article says it is windy & that the plane pulled a tight loop before spinning in.
Sounds to me like it might be an inexperienced or incompetant pilot as a probable reason.
Little odd that no airports reporting a missing plane.