I followed your links and read this stuff in the first post. On the Ryan thing, he never claimed to have any inside knowledge, he just read Ryan's statement.

"JCT, however, does not have the capability at this time to provide longer-term revenue estimates (i.e. beyond 10 years). Given these functional constraints for an official analysis, staff relied on its original work with the Treasury Department and other tax experts to formulate a reasonable expected path for long-term revenues given the tax policies in the Roadmap combined with the economic growth projections available at the time."

How I read this (and how Krugman read it):

Our staff relied on its original work because of the functional constraint of JCT not having the capability at this time to provide longer-term revenue estimates (i.e. beyond 10 years).

A pretty reasonable read, if you ask me. Or McArdle, as you have pointed out: "To be honest, I too found that passage ambiguous."

I'm not sure if that screams deceptive liar who assassinates people's characters in order to protect himself from the "smart and honest," and if it's the most "torrid" claim, you're pretty easily aroused.