There is no indication in the study that such an effect exists in the amount shown by the data. In the 18-44 band most deaths are caused by accidents, followed by suicide and homicide.
It looks like the size of the effect reported in the paper can't be explained by healthier people joining the vaccinated group. Logically, wouldn't it be likely that people with health conditions would be more likely to get vaccinated? The CDC paper notes that they have tried to ensure that both groups had equal amounts of use of medical services so one group wasn't unable to obtain medical treatment.
Your theory requires that significantly more people with health conditions who are seeing doctors decided not to get vaccinated. And that people who did get vaccinated are less likely to be the victims of a homicide, or an accident.
Could you enlighten all of us about why that would be?
By the way, it’s not my theory. I accurately reported what the CDC said. Unlike the author of the article who inaccurately reported what the CDC said.