Instrument Meteorological Conditions.
In this case, Inadvertent, meaning that the pilot supposedly filed for (Special) VFR flight rules in an attempt to fly below the clouds and went Inadvertent IMC into the clouds (an emergency situation that calls for immediate leveling the aircraft, begin a climb, maintain airspeed and heading, then and only then contact ATC and declare Inadvertent IMC and squeak emergency code 7700.
No telling what really transpired though. NTSB will investigate the crash site, gather voice recordings, flight plans and retrieve the flight data recorder.
OK, thanks FRiend. Of course we don’t know anything yet but I kind of side with you that the engine RPM may have not been high enough to allow a safe autorotation.