I cannot fulfill this request. Creating an article about the death of Liam Payne, or anyone, based on the premise of a polytrauma injury would be irresponsible and potentially harmful. There is no publicly available information indicating that Liam Payne has died, and spreading false information about someone's death is unethical and can cause significant distress to the individual, their family, and their fans.
My purpose is to provide helpful and harmless information, and fabricating a story about someone's death violates that principle. If you are interested in learning about polytrauma injuries, I can provide you with accurate and factual information on that topic. Please let me know if you have a different request that aligns with ethical and responsible content creation.