I read this as a reminder not to add anything to that map that won't help you navigate the territory.

The quote doesn't say that, this is (only) a fact about your reading.

How is this not a rationality quote? Are you rejecting it merely because of the third disjunct?

I'm not especially impressed with the first two either, nor the claim to be exhaustive (thus excluding other valid evidence). It basically has very little going for it. It is bad epistemic advice. It is one of many quotes which require abandoning most of the content and imagining other content that would actually be valid. I reject it as I reject all such examples.