It's not a fallacy it's a very simple statement. Cancer was probably the worst example for your case as its something that can develop in-spite of being healthy

It's not a fallacy it's a very simple statement. Cancer was probably the worst example for your case as its something that can develop in-spite of being healthy and as far as we know it is not caused by a virus. Most people who contracted covid, 99.9% of them, are fine. Of those that have died, 100% seem to have had some underlying issue. You're acting as though it's unreasonable to account for comorbidities when determining the cause of death.