Suppose for a second that this was true.

Question: If they need an Omicron specific booster, then how would they manufacture and distribute many hundreds of million doses of specific boosters in a short period of time.

Answer: They can't.

Next question: If the booster does not need to be Omicron specific and the jabbed just got the 3rd dose, then why does it not work?

Answer: It is not about health.