You can make a patch yourself if you like, just remove all fungal things from pk_regional_overlay.json
I’m not sure why you’d want triffids not to spawn, they’re not fungal and don’t spread like fungals do, they’re useful for unlimited vegetable matter for cooking and plant fiber from the stalks so you never run out of thread.
pk_spawnlist_triffgus.json too, you figure it out, the mod isn’t intended for playing with removing things, so you’ll probably see fungal ants or zombies even with the no fungus mod occasionally unless you purge it all.
Unfortunately you can’t expect a mod that makes the game harder to also cater to things you’ve done that make it easier.
I’d make a patch, but I have little time to maintain the mod as is.