several independent investigations were not able to substantiate the claims.
Tyson was investigated by National Geographic and Fox to protect the shows they were producing starring him. I suppose the Natural History Museum looked into it enough to decide not to fire their star celebrity academic.
So the investigations had massive conflicts of interest actually. And none of them had an interest in his actual guilt. An none of them were victim advocates.
The accusations against Tyson are credible and they've never been properly investigated.