Perkins and Mearls have both said that they have been reconsidering the nature of Gods behind the scenes. Some of it is the idea that the gods like Moradin were all originally mortals who ascended into godhood in this new reality; other parts of it is about whether the god you kill is the actual god or its avatar. They've gone back and forth on what those stat blocks for Tiamat, Lolth, etc actually represent. 4e did the same thing. It introduced stats for gods, but then later said that those weren't actually the Gods stats but that of their principle avatars, which are worshipped for all intents and purposes as the god.
It's like how Rand al'Thor thinks he's killed the Dark One at the end of "The Wheel of Time: Book III: The Dragon Reborn" but then we find out it was just his chief lieutenant Ashamael who had been posing as (/insanely thinking he was) the Dark One the entire series up to that point. Then we find out that the Dark One can just resurrect dead lieutenants like Ashamael and Lannfear and that the only real way to end this would be to kill the Dark One. I've never finished the series, so it's unclear to me if the Dark One was ever actually destroyed. But these are really classic tropes regarding deicide.