What's the big deal? This sort of arrangement is as common as tomato soup.
And you note that NOWHERE does Corsi say that the land will become Mexican soverign territory min law, only that it will be treated as such - and what he does not say is that such treatment will be only for some limited commercial purposes. This is not a soverignity giveaway as the innuendo suggests.
I am certain that around the world there are numerous examples in free trade zones where other nations territory is treated as US territory for exactly the same commerce-friendly reasons.
Lighten up.
And Corsi should be ashamed of himself for this kind of noxious stirring up trouble where non exists.
The Mods should start pulling these threads.