The 'thoughtful argument' parts are often hosted in other posts. I generally try not to write 20-page posts, but to break things into pieces. E.g. my reaction to abstract #3 is backed up here and here.

It isn't remotely clear to me from the abstract that the author is "arguing about the definition" of knowledge at all.

Incidentally, I have noticed in that LWers often are not good at distinguishing between saying something novel about what X is, and changing the definition of X.