They confirmed this when the vaccines were authorized. And as part of every drug, there's continual, ongoing, review of the data to ensure that safety is maintained, and that nothing has changed about the drug and its manufacturing. This is the "phase 4" of a drug, continual ongoing monitoring.
> They confirmed this when the vaccines were authorized
No. They didn’t. They said it.
You were the Phase3 trial. You can probably debate the ethicality, the decisions made, but do not pretend they had 5 year data before deploying to the entire world.
Facts matter.