Anyone who uses the term "neoliberalism" is a charlatan. It is an absurd conspiracy theory that has since blown into an amorphous meme out of Marxist historiographers who struggle with the explanatory power (or lack thereof) of their framework.
Mathematical models do have their uses in formalizing assumptions and analyzing dependencies, so they're not all bad, even if the Cowles Commission did go overboard.
(Also let's not forget that the modern methodology of economics came as a result of the Keynesian research program, particularly since Hicks (1937)'s introduction of IS-LM, first modeled by Keynes himself in 1933 as four simultaneous equations.)