Do you have anything a little more definitive than “some parts of some plants can be toxic”?
Nope, your in the zero carb community - We acknowledge some people can eat some plants, but not all people can eat all plants. Obviously people exist who are allergic to some spices and herbs... So the same principle applies, carnivore's can use spices if they tolerate them, but not all people can tolerate them. Every plant you eat is a inflammatory burden on the body, for a healthy person its fine... but many people are not healthy.