No, there was no confusion. It is a story because the official death certificate was made public, that's all, and because given Philip's documented health issues there could easily have been a more specific and abrupt cause of death (heart failure, sepsis, stroke, etc.). Instead, it seems he just faded away. Which I guess some folks will want to know. People like to have clarity, and royal stories garner clicks.
The headline should read 'Philip's death certificate released', which would be a more accurate statement, but that wouldn't be as dramatic as 'cause of death confirmed!'