It's just that I'm emphasizing that that objectivity which enables us to communicate is no more than the conventionality or universal humanness of certain concepts, definitions, and presumptions. That's consistent with saying that such "objectivity" amounts to the human foundation of subjectivity, which means there's no such thing as pure (nonhuman or non-Martian) objectivity. There's the world itself, whatever it is before it's modelled and understood, and then there's what intelligent beings say about it as they try to use the world to achieve some purpose. The latter cognitive project is always partly subjective.

What I'm saying might not sound revelatory, but often there are profound truths that hide in plain sight, and philosophy spells out the unsettling implications of what we take for granted.