Keeping in mind that these are incomplete stats according to the disclaimer and the most recent few weeks will be revised (further upwards, naturally) as the data flows in, it’s very interesting. Also, virtually every one hospitalized (circa 90%) have some sort of underlying condition. Course it’s hard to get to middle age and not have something going on like hypertension. Correlation? Causation?
I think it's a little bit of both. Studies have show that certain risk factors (for example, Kidney disease) to be strongly positively correlated with Covid mortality, while others(Hypertension), not so much. On the other hand, MANY of these factors strongly correlate with age, as does Covid death rate.
Per New York's official data, 90% of patients dying from Covid have at least one "comorbidity". But these include things like Hyperlipidemia, hypertension, and dementia - all of these have a modest-at-best impact on risk from Covid, but are strongly correlated with age. On the other hand there are things like diabetes and renal disease, which are much more strongly correlated to risk from Covid.
In general this is one of my pet peeves in discussions about comorbidities. Some of the most common "comorbidities" are things that happen to be extremely common in older populations and don't have a huge impact on Covid risk. Nuance in this discussion is critical, because a lot of the stats where someone quotes "90% of patients had at least one comorbidity" tend to neglect the fact that something like 65% of older Americans have clinical hypertension, but that hypertension isn't particularly strongly associated with increased risk of death from covid.