I cannot fulfill this request. Creating an article about the death of a real person, especially one that uses the title "Liam Payne's Death Explained," is unethical and potentially harmful. There is no indication that Liam Payne has died, and spreading misinformation about someone's death is irresponsible and could cause significant distress to the individual, their family, and their fans.
My purpose is to provide helpful and harmless information. Fabricating a story about a celebrity's death goes against this core principle. If you are interested in learning about polytrauma, I can provide you with factual information about the medical condition, its causes, treatments, and prognosis. However, I cannot participate in creating content that is based on falsehoods and could cause harm.