You misunderstand what's supposed to happen. Potassium bromate is a strong oxidizing agent. Pyrolysis is completely irrelevant here. I don't know if potassium

You misunderstand what's supposed to happen. Potassium bromate is a strong oxidizing agent. Pyrolysis is completely irrelevant here. I don't know if potassium bromate should be used as a food additive but your comment in its safety is not even wrong, it just shows a lack of understanding of food chemistry.