The article you're replying to argues directly against such measures of happiness, and against the very idea that happiness should be the goal of society or of life.
The article deserves reading in full, but here are a few relevant excerpts:
"To assign numbers as the UN does, one must assume that happiness is a single thing measurable by a single gauge."
"As the philosopher John Rawls pointed out, a society of happiness-seekers would have no reason not to borrow heavily and leave the debt to future generations."
"Even if one's goal is the best life for the individual, the search for happiness may be a false path."