The title on HN actually gets it "wrong" by the way, as it's supposed to be Türkiye, not Turkiye.
Things can have more than one spelling or name, and the "best" one depends on context and personal preference. You can argue from Constantinople to Istanbul about this; but it all seems rather pointless. I wish people would just accept that other people have different preferences. This fits in the "color vs. colour" or "courgette vs. zucchini" category.
Whether Türkiye or Turkiye catches on and becomes the more common spelling? We'll see. I guess it will eventually, but it may take a while.