That’s probably true, that he was referring just to the UK strain. However, if they (UK) are ahead of us in terms of developing a booster for their known variant, why is the US so late knowingly that the Delta variant was well reported back in April crippling India [And now Indonesia] and had already made its way here we suspected in late May. The US doesn’t even have a Phase 1 trial yet, and Phase 3 probably wouldn’t even be completed possibly until late fall and not even available to 2022, with that all said, a booster shot probably would be a little late with a secondary surge early fall, considering that it appears that the UK is already in preparation.
The expected surge is in the unvaccinated population. If they wouldn't take the existing vaccination, why do you think that they would take a booster? If there is a booster, I'll be in line as soon as it opens for my category.