If you actualy believe 10% hospitalization rate which what we are learning now is a big overstatement. They were used as a placeholder to just complete an analysis.
https://www.eurekalert.org/pub_releases/2020-03/tl-pss_1033020.php
Differences in hospitalisation rates by age were reported, increasing with age - with 11.8% of people in their 60s, 16.6% of people in their 70s, and 18.4% of those in their 80s and above estimated to develop symptoms severe enough for hospitalisation
These hospitalisation rates compare with 0.04% of 10 to 19-year-olds, 1.0% of people in their 20s, and 3.4% of people aged 30 to 39. Hospitalisation rates nearly double from 4.3% in 40-49-year-olds to 8.2% in 50-59-year olds
Nearly one in five over-80s infected with COVID-19 are likely to require hospitalisation, compared with around 1% of people under 30, according to an analysis of 3,665 cases in mainland China, published in The Lancet Infectious Diseases journal.
Stop trying to pretend you know anything about this.
These are also reported cases and therefore the hospitalization rates are much less. May be talking about an aggregate of 2-4% now.