You got something here. That is how Americans or people used to the imperial system would write this. This is satire, but not from someone that uses the imperial (inch) system regularly. Here in Germany, you don't use fractions like that like Americans do.
If I remember right, there are only 3 countries that have coastlines at the Mediterranean Sea AND the Atlantic ocean. Spain, France and Morocco.
My guess is, he uses such a weird definition because he is North African but wants to highlight his not being brown, because that doesn't go well with his white supremacy.
There's a certain level of racist that gets really involved in classifying humans into small subcategories so they can know how racist they should be to each one. Used to be popular with "scientific racism" in the 19th century, but you don't see it much anymore.
If I had to guess, after seeing this weird shit and watching too much pseudo-archaology debunking stuff lately: he means the descendants of the Mediterranean and Atlantian people. There's a crazy group of people who think Atlantis is real, and either had a worldwide advanced culture, or at least through the Mediterranean.
The Atlantis myth was heavily accepted by the Nazis as the ancestors of the Aryan people, which is why the Aryans are "so much better" than everyone else. It is still a popular tool to belittle ancient people and to say their accomplishments had to be done instead by this white Atlantian group instead.
E: if anyone reading this has intrusive thoughts of comparing yourself to others, stop that shit. Comparison to others is a killer of all joy, and nobody cares except you.
I love that he included his penis size at all. As if a woman would say, "Oh finally, a man who is letting me know the important details I really care about."
This is one place where the metric system really shines. If I say I'm 6.5", it sounds like I'm desperate for that last half inch. If I say I'm 17cm, that's just what it is.