1. To use modern cave carvers, you will have to edit each individual biome file from the data pack. If you're talking about noise caves, those have been removed as of 1.19.x and I currently have no plans of re-adding them.
2. I don't officially support vanilla biome generation, and by extension most biome mods that might use TerraBlender or something similar. What you can do is manually construct your own biome map by adding to the voronoiPoints list in the biome options, then using the voronoi biome provider.

if noise caves is the modern cave generator then yes. how do i generate them in 1.18 then?

They should be on by default. If not, then you can go into the world customization screen when creating a new world to toggle it.