Er, no, they're right. These were the first ever mRNA vaccines, the technology wasn't even safe to use in 2018 (IIRC there was some sort of breakthrough fix to

Er, no, they're right. These were the first ever mRNA vaccines, the technology wasn't even safe to use in 2018 (IIRC there was some sort of breakthrough fix to the lipid nanoparticle in 2019 that dealt with its toxicity). Even the adenovirus-vector vaccines are very new, the first time that technology was ever successfully used as in an Ebola vaccine created in 2015. I think the covid ones were the second time it was successfuly used.