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Source/Sauce?
I don't know why the original comment is being downvoted. It is not a conspiracy theory to assume that we need booster shots. Is it not like our situation with the flu? https://www.cnbc.com/2021/04/15/pfizer-ceo-says-third-covid-... https://www.cnbc.com/2021/06/22/covid-booster-shots-coronavi... The news of this new study just came out today. Give the guy a break.
No, as other commenters pointed out coronaviruses are different from the flu viruses in that they cannot mutate as easily as flu does. Hence it is possible that booster shots will not be required.