... I should stop trying to draw absolute conclusions from faulty reasoning and sparse information, and get back to doing what I do best: struggling my way up Heaven-on-High by myself in a vain attempt to get the dodo mount solo.

The only thing we can say for certain about the Burn is that it's an aether-drained wasteland which, as one would expect from such a region, appears to be a white sand / ash-covered desert. There's not enough information to draw any sort of conclusion as to its origin (the Garleans believe it was created by primal summons, but this is not verified), and too many hypotheticals and contradictions remain to work toward a satisfactory conclusion.