> Finally, the number of hospitalized individuals included was too small to draw definitive conclusions regarding VE[1] and durability of 3 doses in preventing hospitalization.
[1] Vaccine Effectiveness
effectively this isn't a source that supports the claim that young, no-comorbidity individuals are more likely to get severe disease with 2 doses compared to 3
This is from 1-dose - I couldn't find the supplementary data for that study on 2dose/3dose
but needless to say that no this study does not in any shape or form suggest that it's exceedingly likely that a young no-comorbidity person is more likely to get severe disease with 2dose vs 3dose.
edit: found the data for 2/3 dose comparison - which again does not support the claim, because this is not age stratified data - and we know covid had significant age preference
https://www.nature.com/articles/d41586-022-00214-3
>Blood from individuals who received one or two doses had little ability to neutralize Omicron. But blood from people who had received a booster dose of an mRNA vaccine fought the variant effectively. Their neutralization capacity against Omicron was only four- to sixfold lower than against the original strain.
While younger healthier folks are much less likely to have severe symptoms in the first place there is no reason to believe that what chance they have of experiencing such doesn't decrease further with boosting.