Agreed, it's very much an attempted form of manipulation by hardcore pro-vaccine people. There's a line of logic among anti-vaxxers of "I'll take my chances", and studies like these -- which show that taking your chances with COVID, surviving (which might be overwhelmingly likely), and then going on your merry way gives you equal or greater protection than the vaccine. Hardcore pro-vaxxers would much rather the narrative be "the vaccine, and only the vaccine, will protect you."