2 - The Map is not the Territory, but the map is in the territory. Therefore, any part of the map is also an objective element of the landscape, an objective feature of reality. This includes human minds and human thoughts and human debates about morality.

If you think of your map as a set of sentences that models the territory, an objective fact can be defined as a sentence in this set. So morality is objective in this regard if what determines your moral judgments are sentences in your map. Now consider the following counterfactual: in this world the algorithms that determine your decisions are very different. They are so different that counterfactual-you thinks torturing and murdering innocent people is the most moral thing one can do.

Now I ask (non-counterfactual) you: is it moral for counter-factual you to torture and murder innocent people? Most people say "no". This is because our moral judgments aren't contingent on our beliefs about the algorithms in our head. That is, they are not objective facts. We just run the moral judgment software we have and project that judgment onto the map. I developed this argument further here.