I've always considered Campari to have a sort of strange cloying sweetness underneath the bitterness, so maybe that's what they're referring to here. It's definitely more bitter than sweet though so for the purposes of a cocktail I'm not sure how important a role the sweetness can play.
...Really? THAT was the best way you could think to prevent an accident?
I mean, I'm up for a pair of shapely legs under a yukata anyday, particularly when attached to a dark-haired glasses-wearing onee-san, but that's just silly.