The ATP issuance shows the date of the last issuance. We don't know: that could be his initial ATP ride. Why presume the Phenom was his latest type?
He may have removed a circle limitation. Perhaps he changed a pilot limitation, such as single pilot, perhaps associated with s special issuance medical. We really don't know. That information will be had in due time.
There are numerous possibilities, none of which could reasonably be suspect without a lot of speculation and guesswork, neither of which is professional. Possibilities range from a mechanical or structural issue to a bird strike to suicide to a medical issue. Even a fight in the cockpit. UFO's. Lasers on the dike that surrounds the airport. Tire spiders. We just don't know. We will, eventually. Possibly.