The vaccine peddlers can blow it out their asses.
You don't have to worry about undercutting his credibility...he's done that to himself pretty well.
In my recent semi-annual check up my dr tried to tell me that the vaccine would be more effective against the China flu and even offer some protection against its variants than the antibodies I have from having covid last fall. It was hard to keep a straight face and not ask how covid mitigates two years of immunology doctrine and facts. I let him continue his speech and said I’ll pass. But I took it and have had no ill effects he said. I said if nothing has fallen off you after five years I’ll think about it and he let it lay.