Sure and if skeptic is understood according to its Greek root skepsis aka "inquirer" then it's basically all of Greek philosophy. What matters is which combination of context and colloquial usage seems most pertinent in this context. The notion introduced in the post goes like this:

>Skepticus: Do you have a full psychological analysis of each of these concepts along with the truth conditions for their correct application? No? Well, I guess they are just made-up armchair fantasies invented by empirically-resistant philosophers.

I get that you think there's a more reasonable notion of skeptic that trades on a notion of true scotsman.. sorry, true skeptic, according to your preferred choice of emphasis, but I think the notion of "radical" skepticism as meaning the variety that emerged in what we call modern philosophy, from Descartes and Berkely counts as a fair characterization of a mainstream version of the idea.