A .223 or a .556 are NOT a .22- it’s clear he doesn’t know what he’s talking about.
I am sorry. I do not present myself as gun expert, and had heard early on it was .22lr. In any event, a graze is a graze. If I am vrossing the street and a 1968 Dodge Challenger going 130 grazes me, I am hurt less than if I am run over by a 30 mph Fiat 500.