I'm a current Lear 60 pilot, too. The flaps were likely supposed to be at 20 for that takeoff. However, it is possible that in the post-crash fire that the flaps were damaged. Also, during the crash it is possible that the flaps were forced up by impact/damaged hydraulic lines, etc.
The flaps are not composite... normal aircraft metals.
Could be a high-speed abort I dunno.... the 60 has horrible wheels and brakes. They are the same from the 20 and 30-series lears (much smaller jets). Brake energy is real problem on the 60, even with brand new brakes and a test pilot flying.
Tragic... hate to see this type of stuff.