when the Neoreactionaries aren't busy reviving obscure archaic words for their own jargon, they're using Lesswrong-style jargon

I believe the fact that neoreactionaries make frequent use of LW jargon is down to more than a founder effect.

There are multiple aspects to the LW memeplex that perform significant legwork in laying an epistemological foundation to mug intelligent social liberals with reality, which is close to the defining trait of neoreaction. To wit,

• Physicalism, determinism, a universe Beyond the Reach of God; the universe is capable of arbitrarily deviating from wishful standards of fairness and equality, there are no cosmic attractors towards justice, humans can be effectively damned beyond redemption by biological variables outside the loci of moral agency.
• Generalised optimisation systems; once you understand these, the leap to criticism of democracy as a massive cybernetic failure mode is almost trivial.
• Game theory, for the public choice extension to the above.
• A deep epistemology of taboos, which form the Dark Matter of democracy, around which our governing narratives swirl otherwise inexplicably.
• Beliefs as constraints on expectations, versus belief as attire; this in itself is sufficient to generate enough conflict with official truth to put one far beyond the Overton window.