That tweet is from back in February 2021, when there wasn't enough solid information against vaccination yet. There was only reason to be skeptical because it was new and couldn't possibly be well tested yet. I was vaccinated myself in Aug 2021, having done a lot of research, and considering myself a borderline case (I was always against mandates, and never thought kids should be vaccinated, even back then).

When he says "we should aim to safely vaccinate everyone who is eligible" I don't presume he meant to force it on people who don't want it, although if you take it strictly literally it sounds that way. But at that time, people just presumed everybody would want to be vaccinated, so making a distinction at that time about those who wanted it vs those who didn't wasn't even part of the public consciousness yet.