It really comes back to the testing. There could be a million people 20-44 who didn't get tested and didn't need to visit a hospital.
If you only test people who arrive at a hospital with serious symptoms, it's not surprising that many of them go on to be admitted.
That's not a shocking number to you? 15% - 20% of people aged 20-44 ended up hospitalized? Even if no deaths were involved, that many young people ending up in the hospital is concerning.