Sure, but is it a felony-20-years-in-a-FPITA-prison illegal, or a giant-fine-and-revocation-of-pilot-license illegal? :-)
Probably the latter unless someone gets hurt. (Agree with you that this was a dumb cover-up. Particularly when he seems to have done the cover up before posting the video?)
If he had dismantled the plane before the FAA knew about the crash, would that still qualify as destroying evidence?
Rape isn't funny. You might want to consider not using that slang term.