Confusingly, you seem to have taken this from Karl Voit's website, without referencing having done so?

https://karl-voit.at/2017/09/23/orgmode-as-markup-only/

And then taken the sentence out of context. His point is that even though there isn't a formal Org-mode syntax definition, there is an informal one in that all of the Org mode syntax elements are part of the Emacs Org-mode implementation. The latest Org-mode implementation /is/ the spec. This is in comparison with Markdown where there are numerous syntax definitions and no implementation which includes all elements and everything is a mess.

> This is in comparison with Markdown

This context is irrelevant, I'm not discussing how bad markdown is, but how great org mode is.

> The latest Org-mode implementation /is/ the spec.

You're just conflating the terms, that's not what a spec is, and having one has benefits that living impls don't have