amom, in many cases of elderly, this is something that adds up to “pre-existing conditions”, especially in a moment of crisis when the person is in a nursing home or other similar condition. It is hard to tell a posteriori whether people would have survived otherwise or not. But given sudden bursts of levayas at the time it happens, it is clear that many of those deaths are untimely.
I don’t know to what degree things are predictable. I know several middle aged, medium unhealthy, people who had one case that was mild and next year second – very hard and even ICU.