"Metacybernetics" is a concept with a small handful of Google hits, some of which appear to be obscure research papers and some appear to be metaphysical crackpottery on blogs.

I think it's worth considering that the theories you're familiar with are incredibly niche, have never gained any foothold in mainstream discussions of system dynamics, and it's not wrong for people not to be aware of them (or to choose not to mention them) in a post addressed at general audiences.

Further, you just missed the opportunity to explain these concepts to a broader HN audience and maybe make sure that the next time someone writes about it, they are aware of this work.