I don't think the question is aimed at the people who believe it's a trackable chip for Bill Gates to control your mind so much as the people who have no clue and know they have no clue but have heard some rumour vaccines have some connection with 5G which is bad, apparently, and want to understand whether it's true. Asking the question in a purposely silly way (is that really what Dave meant when he was talking about 5G?!) and then giving a techy-sounding answer that sounds like they're taking the concern seriously probably does reassure a lot of those people.