The !hackernews cross-post of this link got something like 17 downvotes. And this one got three. As I read the science.org article, I'm wondering if most of those downvotes don't come from assumers equating this to anti-vaxx crap.
To be clear: the article is talking about the underlying mechanism of a rare side effect of one type of vaccine (AstraZeneca), already restricted in or dropped from multiple European countries*. It got replaced by safer vaccines, even if the 1/200k chance of triggering the side effect was not a big deal to begin with (specially given how many people COVID-19 was killing back then).
*and from Brazil since 2023. Source in Portuguese.