Sad to see. It seems to me that the pilot was caught out by the classic “apparent airspeed” phenomena. Flying downwind at very low level gives a false visual impression of aircraft IAS if you’re only looking outside, rather than monitoring the ASI.
Low IAS, gusty wind, a heavily laden aircraft, AOB increasing to avoid terrain, all leading to a stall/incipient spin LOC.
Easy to say in hindsight, but flying the manoeuvre in the opposite direction would have prevented this because any gusts would tend to increase the IAS, rather than reduce it.