So we have here a 'guess' about what people actually trained to think about morality might be thinking, as well as reasoning based on what people insufficiently trained in morality think.

If anything, this might serve as an argument that we need to actually treat ethics seriously, and teach it to everybody (not just philosophers).

He seems to regard intuition as though it's not a sort of perception. That seems clearly wrong.

I was amazed to note that this was being presented in a philosophy department. But then, I don't know what Princeton's department is like.

It seems inconsistent to be denying moral realism and then making claims about what sort of language we should be using.