I'm trying to remove Rogue Spawners from generating but the game just crashes when creating a new world.

latest.log

that is invalid syntax

https://github.com/Shadows-of-Fire/Apotheosis/blob/1.20/src/main/resources/data/apotheosis/worldgen/configured_feature/rogue_spawner.json /

https://docs.minecraftforge.net/en/latest/resources/server/conditional/

Also why not just use WorldgenEvents since you're using KubeJS

WorldgenEvents is disabled in KubeJS on 1.20.
Edit: It appears they have fixed the worldgen issues, I am mistaken.