He seems to have suddenly lost interest in seeing where it leads!
Well in this post you said that you hold essentialist views, albeit conflictedly.
Yeah, that’s roughly right. 
Foot’s 2001 book Natural Goodness is freely available, you just need to log into the website to ‘borrow’ it. Maybe have a look and see what you think. Or we could look at what she says in earlier works if they are available online.