That's similar to what is playing out with COVID. Your cancer example isn't the greatest example, but is it possible that the bronchitis which ultimately killed the cancer patient would've been cured without COVID making it much, much worse? Yes. Would the cancer patient eventually have died from some other infection? Most likely, as the treatment for cancer absolutley decimates the body's defenses. Should this be tracked as a COVID death? Borderline, but if COVID led to an earlier death than would have happened without having COVID, then I can see an argument.