Basically this is a graph...
Of a poll...
Of everyone's WAG. It says nothing whatsoever about how well-informed a person is, or not. That's just a guess on your part, that a Dem wasn't properly informed.
This is not a poll of who was well-informed, who was misinformed, who was doing the informing. It's peoples' perceptions. And since the loudest voices were Republican F.U. Vaccine (& FU Democrats) voices, and people knew that the aged were getting hammered...
That seems like not a bad guess for someone who is not analyzing a table of actual results/ risks/ exposures/ hospitalizations, etc...
If I had to WAG, I'd say 50% of the unvaccinated were a hospitalization risk as well. Just on a WAG.