The low speed on the ADSB is a red-herring because if it was hypothetically diving steeply to get to the suggested descent rate, the airspeed would not increase significantly on the ADSB feed.
It wreaks of some kind of stall/spin, however the swathe and condition of the wreckage mostly disagrees. It’s interesting. I’m guessing a 16 year old on a first solo may have been recording on a GoPro.