But in fact on further reading, this seems more cock-up rather than conspiracy. The complaint was over some text that read
He used the same layers of fossils that had supported the Genesis view of evolution to show the slow changes that are taking place over the millennia of earth history.
The complaint was that there is no Genesis view of evolution, which I guess is a fairly reasonable one, and the museum's position is that this is just an opportunity to correct some badly written text, rather than an opportunity for secular activism, which I also think is probably a reasonable stance (although the complainant was supposedly a Christian fundamentalist).
But whatever the real reason, it gave me an excuse to point out the excellent and hilarious Simpson's episode!