Honestly I think it is a little hostile. Not towards frequentist directly, but towards the mis-use of frequentist methods in science. He works in ecology and I think he comes across a bunch of crap all the time. He talks at length about the statistical crisis in science and I can't really blame him.
But I could see how someone might take this as an attack on the methods themselves.
I agree. The golem is presented as an analogue to any statistical inference: powerful but ultimately dumb, in the sense that it won't think for you. That's in my opinion the major theme of the book---you have to think and not rely on algorithms/tools/machines...or golems to do that for you.
But I could see how someone might take this as an attack on the methods themselves.