After the announcement, another was made by Yui and her squad, influenced by Voda to do so, that solidified everyone's knowledge about the Gods as he said that Satoru has slain multiple of them and that he will not stop there.
It was chaotic, but all knew of it. The main issue wasn't the lack of knowledge of a higher species from most but instead the unknowingness where to begin their search for him.
Kazumi didn't realize that and even though he didn't spend much time with Satoru at all since he had achieved Godhood didn't mean that he wasn't no longer his idol, so he contacted his uncle Hikaku and left to train after the entire announcement was done.
Zankoku remembered Atreus' words, in reality Voda's, about Hermes' left behind arrogant energy and intended to absorb it after he gets there to even the playing field a little. He listened to Nova more, hence why he was quick to turn against him.