Hello Bomaz,
Depends a bit on what you mean by "removed biters" and whether you have done so using this mod or some other means.
If you have used only the /remove-biters command, then the biter base generation is still enabled and all you would have to do is travel a bit further away in order to generate new chunks with biters.
If you have used the /disable-biter-base-generation nauvis in combination with /remove-biters, you would first need to re-enable biter base generation with the /enable-biter-base-generation nauvis command, and then explore new chunks (similar to above).
If you have used some other method (another mod, or maybe vanilla game options), I'm afraid this mod will not help you with that.
Another catch is that if you have used this mod to disable biter base generation, and then removed the mod from your savegame, this has also removed the mod's data where information about biter generation is stored (so in that case the /enable-biter-base-generation won't help you either).
So... What is it that you have done exactly? :)
Best regards,
Branko
