As others are pointing out, this is a wild misreading of a study that actually showed all education levels becoming less hesitant. PhD's quite obviously held constant modulo sampling error, and that's exactly how it's described in the paper:

The relevant chart is on page 27 of the paper here: https://www.medrxiv.org/content/10.1101/2021.07.20.21260795v...

Also note that they call out the weird results with PhD's as an outlier without an explanation (other education metrics show less hesitancy with more education monotonically), and call for further research.

To wit: you're spinning like crazy here trying to make this data say something its authors expressly disclaim.