So, I theoretically could use this content, even the fluff. I can just set these cities, and their rulers, as in a different part of Athas, far from Tyr and the other "main" cities on that one map.
That said, as many have pointed out... this project really is just plagiarism. There is a difference between homage and rip-off, and this definitely tilts to the latter. If I wrote this setting up in a class and presented it as my own work, I would get an automatic fail for copying another established creator.
So no, definitely can't support this.