As the article says - this isn't about "rights" as much as it is about building casinos. Not that I blame the Indians - I'd want in on that action as well.
If the tribe had gotten their way, not a single property deed in America would be completely safe.
Personally, I don't think it's anyone's business what they planned to use the land for... it's not really that important of a detail. They got swindled out of land. Period. However, it's just a tad bit late to be bringing this up now - It happened prior to the formation of our nation, and if it was a legally-binding agreement/treaty that carried over upon formation of the new nation (and it is) then that's how it goes. Too bad so sad.
Of course, I feel the same way about legally-binding agreements/treaties that are in place that benefit Indians, too, so at least I'm consistent ;0)