Use common sense and think about it. Number of deaths divided by number of people having it.... Do you really believe that's the correct way to calculate mortality rate?
The real rate is actually number of deaths vs number of recoveries... People who have got it and then recovered from it. That number is not yet being published widely simply because it is such a new virus.
Therefore, I personally rubbish any claims at mortality rates at this point. Up to you what you want to do