Apparently the museum used outside investigators, and Fox / Nat Geo used internal investigators.
It wouldn’t surprise me to have a media company’s bias being toward protecting their content investment. That person’s face is in every show set to run, rerun, and stream. A museum is kind of different. It’s the in-person exhibits that are the main draw, and a their bigger risk is probably the litigation from substantiated allegations.
I work in this risk / ethics space, and I’m not surprised that the museum was more motivated to look into the claims, as opposed to simply saying they looked into the claims.
And that said, I’m also just some rando on the internet.