It's difficult to draw any real conclusions from this study because they divided the population into people older than 70, or younger. This is a very coarse grain division with a high mean age, which means we have no way of telling whether a sizable number of people were young/healthy people with no preexisting medical conditions.
If we know anything about COVID it's that the vast majority (>95%) of hospitalizations involve people with preexisting medical conditions and the vast majority of those are old.
They say that people under 70 years old were more likely to get re-hospitalized. But what's under 70 years old? Are we talking about 65 year olds? Or 40 year olds? That's a huge difference.
There are a thousand and one ways to misrepresent this data which is why they should have provided much finer breakdowns by age and preexisting conditions. Without further information historical data implies that the vast majority of the people they are talking about are older people with preexisting medical conditions.
Yes, COVID causes these people to die more often. But that's not really news. At best, they are saying COVID's mortality rate is 30% higher than what we thought it was. A 30% increase to a tiny number is still a tiny number.