XXY/etc are all variations within a sex. The above poster is correct to point out that sex is defined entirely by the gamete size that one's body is organized around producing in anisogamous species like humans, and is binary.

Intersex is a misleading term, the better term is https://en.wikipedia.org/wiki/Disorders_of_sex_development. There are male DSDs and female DSDs. Even in the case of ovotestes, you'll have one gamete produced, and the other tissue will be nonfunctional.

Not only have you undermined your claim to a Nobel award by showing a spurious understanding of biology, you wrote, quite sarcastically "it is impossible for humanity to discover new information that updates our world model". Well then, we will all await your discovery of that 3rd gamete, or some theory so innovative that it tips this well studied, well understood, uncontested (by any valid competitor) model to the wayside and humanity can revel in this new information, the better model of reality that you promise.

While you're at it, you could tell us all what the scientific discovery was that made gender separate from sex, who found it and when, and what the defining difference is. Did they win a Nobel for that?

I request that in any reply, you refrain from spamming me with Wikipedia links to articles you don't understand and probably haven't read.