Let's stay focused on the hot peppers.Ever heard anyone say you can get through a day without sex but not without a good rationalization?
I do not have the time to gift to you for the sake of 5-pepper plants. I beg your tolerance and forgiveness.
Nevertheless, I appreciate your identifying the most likely cause of the plant's illness. If it did, in fact, become infected by the herbicide, it was RoundUp weed killer, and as I understand - it is systemic - so the plants will die anyway if that turns out to be the case.
If not, they will live, though maybe shorter in stature...
If they live, and I go buy a few more plants today or tomorrow, I'll just have more plants.
If they die while I wait to see what happens, I'll have no plants.
It's not easy being a Zen Master...