I made no "claims" as you put it. You are reading in to what I'm saying. The story about her death did change. They now claim she was up the stairs when she had a heart attack and then tumbled down the stairs. Unless they have security camera footage of the event they have provided no proof that she was up the stairs. They are making assumptions and conclusions based on those assumptions. But like you they desire a quick and easy explanation for things. The NYPD and the coroner are hardly strangers to "massaging" the facts because someone desires a particular conclusion.
It is entirely possible that an elderly woman put on high heels despite her friend having already said that she was in such pain from her hip and leg that she couldn't leave the house. Should it be examined? I say yes but you say no. It is not an "extraordinary claim" as you put it. It arises from the post incident statement of her friend who says Ivana made that statement in the last few days prior to the incident. The act of putting on that kind of shoe is quite contrary to normal behavior for someone in such pain that walking out of the house is too painful. There is no way, absent camera footage, for the coroner to say she had the heart attack prior to the "blunt force injury to her torso". Despite your belief, the heart attack doesn't leave a moment by moment time stamp. Elderly people can easily suffer a major impact to their body and then have a heart attack. She may have fallen down the stairs and may not have. I see no proof provided by the coroner nor an explanation for the shoes and therefore I reserve accepting their conclusion.