But doesn't that make a "study" like this just a sugarcoated lie?

Arguing that something is true because it is too difficult to research the subject properly seems just wrong on so many levels.

I find research ideologies like this at its very core highly dishonest. Sure, people who are really into the subject and methodology understand a study's limitations. But all it does is leading on the media to hype one week the story "A makes you live longer" and another month later "A makes you die faster".