The idea that we have some deaths attributed to Covid 19 that might otherwise have occurred because of other conditions like cancer and heart disease is rather beside the point, and only of interest to people obsessed by numbers. The medical facilities of advanced countries are calibrated to take those deaths, and those struggles, into account. So, generally, we have x number of ventilators and that number is adequate to deal with everything except occasional overloads which can be transferred to other hospitals. Now, we have a very serious shortage of ventilators which tells you something -- we're having an extraordinary health crisis involving thousands of people simultaneously, and a large number of them are dying. Parsing out which might have died anyway is a fool's errant -- they're dead. The only good reason for trying to determine the number of excess deaths (which can only be done when it's all over with) would be to serve as a warning of what could be coming next time, and could be even worse.