The review didn’t have to study patients—the studies themselves did that. This doesn’t give us any reason to believe that the review’s findings are false or of limited scope.

Even though coffee-drinking might not affect the heart, health is broader than that. This opens up the possibility that coffee could harm some other aspect of health, thus undermining the press release's conclusion about health overall.

We’re concerned with coffee. The press release isn’t saying that “coffee and cake” is safe; it’s saying coffee is. The safety of other foods isn't relevant.

We’re only concerned with how coffee affects health. It doesn’t matter what other beverages do.

This is saying that large amounts of coffee-drinking may be a consequence of stress, which itself harms the heart. But this doesn't suggest that coffee may be bad for health, just that it might correlate with poor health.