I'm not sure you could call him a conspiracy theorist
I don't think there's anything wrong with a man who is a great sportsman and has to take care of his body being a cautious of a vaccine that hadn't even gone through a vigorous testing over a long period of time vacciness is supposed to.
I don't think you have to be a conspiracy theorist to understand that it was a rushed vaccine. You only have to go back in history to see how many vaccines have turned out to be problematic and weren't really realized until the future but at the time they were seen to be perfectly fine.