After learning what physical evidence actually is, you must now realize that NIST admitted they did not use physical evidence to come up with their speculative hypothesis.
So what?
Documentary evidence IS evidence.
You're playing the game of implying that documentary evidence is somehow subservient, lesser than, physical evidence.
You'd be wrong about that.
Furthermore, it is merely (& inconsequentially) a LEGAL definition, not a reality based definition, that video tapes & audio tapes are not considered physical evidence. They contain precisely the same qualities of all other physical evidence. There are physical magnetic domains on those tapes that can be examined & analyzed for their content in PRECISELY the same way that a hunk of steel can be examined.
Now that you've lost on every other stage (engineers, academics, historians & popular opinion), you & MM are now trying to move the matter to arena of legality.
To see what hairs you might be able to split.
Sorry. You've already lost there as well. See KSM.
Too bad. Another straw slips thru your fingers.