That's the point. GP deceptively suggests that what the EU escapes in gun deaths, it makes back in spades in heat deaths, providing GP with great ideological schadenfreude. Except this doesn't actually follow, in part because these are fundamentally different mortality categories indeed (and in part because the counting methodologies involved are drastically different, etc).
Unless you are a psychopath and consider shooting another person intentionally a harvest death, they're not the same.