This is the most bizarre thing I’ve seen in a long long term time. To me it smacks of someone thinking they’re clever by making a parody (except it isn’t very funny) or homage to the old Athas without it being accurate. Either way, it was going to get the backs up of fans of Darksun (of which there are many).
You have to be familiar with Dark Sun, defiling, it’s lack of pantheon, know what a drey or Athasian dragon looks like, and the fact that Fyreen sounds like Pyreen.
All in all a pretty cheap shot. Too similar not to be referential, too different to give fans a hope that anything resembling the original will be forthcoming.
Very disappointing, and just reinforces my feeling that if I want to enjoy 5e going forward I need to rely on third parties, because what’s coming out of WOC is a steaming pile.