1st hit: Coffee Drinkers Have Slightly Lower Death Rates, Study Finds
2nd hit: Stieg Larsson's Death: Coffee Or Conspiracy?
The first one doesn't even have the phrase "death coffee" in the page! And in the second one it's split up with a colon in between (technically correct, but not a single phrase).
And only after that, come the expected results, where "death" is a modifier of "coffee" (coffee was so strong we called it "death coffee"), which is what you'd expect when you put a phrase in quotes, no?
Results I'm sure the old Google of a few years back would have presented me as first hits, too.