Irrelevant, and you know it.
First, even if it was leased, which Cuba has claimed it is not, military bases are considered American soil, just like embassies are. When you are on them you are subject to that country's laws, in this case, the laws of the United States.
Second, since the US directly claims that the lease is valid, they are making a point to establish that the military base is in fact US soil. The only case you can make that Gitmo prisoners are not in the US already is to first concede that the base itself is maintained illegitimately.
Come to DC, and to embassy row, and you'll have the ability to visit many countries while you're here.
The administration already brought the Uighers on US soil.