FWIW...
"Dan Gryder has made claims to have found D.B. Cooper's parachute in North Carolina in 2022. Unfortunately, this parachute cannot be from the Cooper hijacking because it doesn't match the original case evidence whatsoever."
From the linked transcript.
How to call someone out as a hack, without calling them a hack.
And he obviously is aware and tiptoeing around the litigious potentials.
I want you all to understand that this is not a personal attack on Dan.
He's a busy guy no doubt. He has a YouTube channel with over 100,000 subscribers and he produces long form content that people out there clearly enjoy, so with everything going on in his life I doubt that he has the time to comb through thousands of these FBI documents from the early '70s and to arrange them into a searchable database, which is what I have nerdily been doing for the past several years...
...To reiterate what I said earlier this isn't an attack on Dan personally, I just don't think he was aware that we have the original documentation now, thanks to the newly released investigative files that were obtained through the Freedom of Information Act.
Hopefully he can accept the original evidence, and doesn't resort to suggesting that all these modifications happened at some later date after the Cooper hijacking, even if we presume that McCoy was indeed Cooper.
Is he [McCoy] really going to keep evidence from a capital crime in his belongings as what, a souvenir?
And then he's going to take this souvenir from his capital crime to a Master parachute rigger to have all these modifications done to it?
Nah. Come on.