If, magically, you get a choice between getting a more accurate map or a less accurate map, you should always choose the more accurate map.

I think that point he's trying to make is that natural selection doesn't magically get a choice between maps. In general, a more accurate map will only become available to the mind of some creature if it happens to be adaptive for genes in a particular population in a particular environment.

Think of all the creatures with really bad maps. In terms of reproduction, they are doing just fine. For some species, their relative reproductive success can be improved with more accurate maps, but that's a means to the end of reproductive success,

There are many ways to "make a living" in evolutionary terms, and having a mind with accurate maps is only one of them.

Think of all the creatures who don't have "maps" as humans do. They are still being acted upon by natural selection.