Some interesting information available particularly from Blancolirio on YouTube. The pilot lost radio contact and was way past the normal descent point when he reestablished communication. The controller trying to be helpful told him that he would be vectored over the airport at Buffalo with a turn back onto downwind (logically left 270 degrees to give room to descend). The pilot may not have understood this and as a private pilot flying a very high performance aircraft it is speculated he got behind the aircraft and lost situational awareness. In any case a very high rate of descent and speed developed along with a right turn in the direction of the downwind. The radar shows speeds well over 400 knots and it is possible he exceeded VNE and there was an ensuing breakup. This is just speculation, but it is one scenario that might fit the information available so far. I fly a high performance single (not nearly as high performance as a TBM) and the incredible amount of automation can make normal operation very simple. But once you get outside your comfort zone things can happen very quickly, particularly single pilot.