It calls out what they see as a liberal trend of "factiness", that is, the feeling of knowledge without being able to actually use that knowledge to predict the

It calls out what they see as a liberal trend of "factiness", that is, the feeling of knowledge without being able to actually use that knowledge to predict the future. It mentioned other liberal-aligned media that creates this feeling of knowledge, such as ted talks and "NPR-style neuroscience". Basically, it's calling out the liberal trend to presume that the facts are on their side and then be wrong about it. Presumably due to a failure in their epistemology, how they gather and sort data about the world. There are a couple of other minor points and rhetorical points, like equating liberals "factiness" to the hated outgroup's "truthiness". But that's the general thrust.