The poll you refer to is a Forbes article written as a hit piece on Republicans. It is not a poll but refers to a poll. That poll is by KFF and uses surveys and qualitative information. If you read it closely there is no mention of the actual sampling method, frame nor any of the typical statistics R2, t, F to determine statistical significance. Polls of Republicans typically have high bias of non response and how that is handled greatly influences the results as 2016 showed. The poll I remember found unvaccinated were about 50/50.