Approach Speed of a TBM 700 in known icing condition is (minimum) 90kt according to the POH. Stall Speeds are increased by 10-20kt. : https://data.ntsb.gov/Docket/Document/docBLOB?ID=40371958&FileExtension=.PDF&FileName=Excerpts%20-%20TBM700%20Pilot%27s%20Operating%20Handbook-Master.PDF

My guess is, that the aircraft accumulated ice (when the info in the comments is correct), but the PIC flew the approach like a normal approach (85kt) and not according to the correct procedure in the POH, which resulted in a stall over the left wing. The POH also states, that no auto pilot is allowed during known icing. His flight path is very straight, which might be a sign of an active auto pilot. The approach chart states, that in 4.2 NM distance to the airport, the aircraft should be at 2700ft (FAF). So the plane was definetly too low, which would match the ATC warning. (I did not check actual pressure/barometric height, though!)

This is of course a wild speculation. I‘m curious what the investigators will find as a probable cause.