CVR
I think a lot of the public consumption gets too wrapped up in the "V" word in CVR standing for Voice.
There are other pieces of evidence also captured by the CVR which are electrically driven through the wires coming from both the Mics and the power source.
The electrical experts know what circuits do when severed and acoustic experts know what airborne noise travels to mics as well as structure borne ringing. All it takes is a half second of this stuff imprinted on the CVR to assess