“It’s living in a way that fulfills our purpose,” Helen Morales, a classicist at the University of California, Santa Barbara, told me. “It’s flourishing. Aristotle was saying, ‘Stop hoping for happiness tomorrow. Happiness is being engaged in the process.’ ”

This is very generic. There is no reference to the crucial point of Aristotle's argument: eudaimonia depends on the exercise of rationality as a faculty unique to humans as a species. It's not just a wishy-washy "get engaged, have dreams, make projects, live a fulfilling life" stance.

Also, the article says nothing as to how people were surveyed for eudaimonia. I glimpsed through the actual study and found that it is based on the Short Flourishing Scale: http://internal.psychology.illinois.edu/~ediener/Documents/FS.pdf

None of the items of the scale has anything to do with human rationality. Thus, the study has nothing to do with Aristotle at all. Which would be fine if the article didn't state otherwise. I guess someone just read the word eudaimonia and went: "Wait, didn't Aristotle use the word too? I can totally make an article out of this".

Bottom line: it's yet another piece of poor scientific divulgation.