I don't understand this logic. Because this native american tribe has sovereign immunity for historical reason, the patent they own cannot be patent-reviewed by

I don't understand this logic. Because this native american tribe has sovereign immunity for historical reason, the patent they own cannot be patent-reviewed by US government? Why this works? Can't US(and other coutries) nullified the patent for the their jurisdiction? "Yeah, that patent is still valid. Only among your tribe though. All the outer world decline it's validity. Good luck with that."