I dont think he's talking about direct hits to hearts. He's just citing an example that it does happen. People can take a hit to the heart and continue on.
That's kinda playing fast and loose with words though. By that same standard I was shot in the back of the head and not only survived, but was able to continue fighting back. (actually running away) Of course the kicker was that it was a pellet rifle I got shot with and the pellet ricochet off my thick skull, NASTY flesh wound.