It's not a "good" wage in the US. It's exactly median.
Which is fine, someone has to be median, but really underwhelming for the (presumably highly-educated and talented) head of the #1 national historical monument.
No, you did not subtract those things from the UK pay. The $86k pre tax UK wage comes down to something like $64k post tax. Whereas a $125–160k US earner in South Dakota takes home $97-120k, paying another $6k for health insurance. 91 is in fact larger than 64.