You can't convince him to get a covid vaccine.
Best not to waste your time or energy discussing the topic with him.
It sounds like he has zero willingness to listen to either your opinion or government guidelines about following pandemic restrictions.
He is an adult who knows that he won't be able to travel to much of europe without proof of vaccination, has made up his mind and probably rarely or never wears a facial covering in public places.
His choice, his life, his body.
In the event that the police catch him habitually flouting mandatory lockdown restrictions, it will be his fine or criminal record too.