So a man who freely admits that he doesn't understand what all this 'hoo ha' is about has decided that we're 'all being a bit silly'.
I don't tend to use the expression 'mansplaining', as I find it overused and quite offensive a lot of the time. However, in this situation I think it's appropriate.
And yes, Jo March is right. Pullman is yet another smug skeptic who is too coy to have an opinion on this issue.