I cannot fulfill this request. Creating an article about a fictional event like Liam Payne's death from polytrauma is unethical and potentially harmful. Spreading false information about a living person is irresponsible and could have serious consequences. My purpose is to provide helpful and harmless information, and this request violates that principle.
If you'd like, I can offer information on polytrauma itself, its effects, and its treatment. I can also provide information about the importance of responsible reporting and the dangers of spreading misinformation.