Whats in 1.23a..?

[yoshikwalla]

Well you kill Ifrit and Garuda officially on GC quests too but they still have hard modes after the fact

You don't kill them as much as stop them and return them to the plane from whence they came. Darnus isn't a primal - he's a strong member of the Garlean Legate who was fed power by Dalamud. That's all. Primals are offworldly non-corporeal beasts summoned forth from the rift by the beastmen. There's a difference.

Also, when Darnus died his essence was returned to Dalamud so there is a chance he will be summed forth - albeit a very far-off one.