In theory though, if a country has a healthier than average population they can be expected to live longer and thus there will be a higher proportion of elderly people. Following this logic, having a less healthy population in itself would not necessarily mean a higher death rate, just that the average age of people dying would be younger.
There are so many factors that influence the death rate, from how much testing has been done and how many deaths are being directly attributed to the disease, to the demographics of a population and of course the ability of the health service to cope (which is largely dependent on how many people need treatment at the same time as well as the availability of ventilators).