Nobody recognizes even the claimed pie slices (except the 7 claiming countries), just as none of the parties would recognize any claim on Marie Byrd Land (aka Westarctica).
It still remains a fact that no country claims that territory. And that's interesting in some abstract way to people with the fantasy of forming a country. Which is exactly what the parent comment was referring to.
The whole thing is just meant in fun. Aside from the fact that the treaty binds only the signatories.