Indeed. The only way any of the sceptics' claims have even a sliver of validity is as a motte-and-bailey fallacy of their original claims. For example, the claim that the vaccine doesn't work morphed into the claim that the vaccine doesn't stop transmission—a claim which wasn't even true until the delta strain showed up. Omicron has been a substantial challenge to vaccine efficacy (vaccines which, it's important to remember, are still only tuned to wild type COVID-19) but they're still providing significant protection as proven in large scale statistics.