That could very well be. I had an impression that meta-rationalists are arguing against a strawman, but that would just mean we disagree about the definition of "rationalist position".
I agree that one-true-map rationalism is rather naive and that there are many people who hold this position, but I haven't seen much of this on LW. Actually, LW contains the clearest description of the map/territory relationship that I've seen, no nebulosity or any of that stuff.