Yes, that's the conclusion. You could quibble a bit and compare CAE hospitalizations instead, but they'd still exceed the expected 120-day COVID-19 hospitalization rate. On the other hand, "expected" is based on past data, and their benchmark for "high" hospitalization risk is January 2021 in the US. Depending on how much higher the current wave will go, it might retrospectively turn out to be safer to have gotten vaccinated after all, even if you're a 12-year-old boy without comorbidities.

Because the text in quotes is not in the paper.

Maybe because the study has nothing to do with boosters or overall Covid risk. Myocarditis risk is lower with boosters than with 2nd shot in Israeli studies, but again the reason to get vaccinated is not just about myocarditis.

More nuance and Israeli data here: https://www.statnews.com/2021/12/09/fda-expands-authorizatio... (this is also about teens specifically and not <45 question in the GP)