How was this burger cooked?

I got into a little debate last Friday with my friend about burgers that got me thinking. He wasn’t a big fan of Ray’s Hell Burger cooked medium-rare with the au poivre preparation. He went on to explain that he was a “burger purist,” so he’d try Ray’s again without the mish mash - Just a “real burger,” he said “cooked medium well.” “Burgers aren’t supposed to be bloody.”