Don’t obsess over this. It’ll distract you and stress you out, which comes with its own health risks. None of us get out alive anyway. Go live as healthy a life as you can, find happiness, and help others when the opportunity presents.
They were, of course, speaking from a position of ignorance of long-term side effects, because the data wasn't yet in. It's been two years, and in many ways, the data is still not in yet.
We'll have another go-around[1] on the COVID rodeo next holiday season, if another dangerous variant emerges.
[1] Just because the news has forgotten about the virus, doesn't mean that the virus has forgotten about us. There are more daily worldwide cases right now, then there have been at any point prior to November 2021. That's a lot of opportunity for variants to mutate.