People argue over how important it is, and it's certainly not the only thing that matters, but yes, the general consensus is that IQ is meaningful and predictive.
But if you read the article, they're not really selecting for IQ itself, but academic success, so that covers all of the factors, just weighed.
A broad definition is ability to solve problems. Beauty is outside it unless it really solves some problem... which it well might in some occupations.
There are roughly three things that make you successful: 1. Being smart 2. Working hard 3. Opportunity
Everybody can do #2, but most won't. #1 is at least partially genetic. #3 is mostly luck, but is influenced by the other two. In fact all of the factors influence one another to a degree. Being born in an area with good schools and working hard can overcome somewhat deficient genetics for #1 for example. On the flipside, being born a genius in sub-Saharan Africa with no opportunities or even anything to work hard for makes success almost impossible.
Opportunity counts the most. You can't win if you never get the chance to play.
Motive is next, as you can't succeed unless you have the will to do whatever is necessary. At some level, sufficient motive can generate additional opportunities, but there is an upper limit on how much you can supplement the genuine opportunities arising from pure chance.
Method is least important. There are often many ways to accomplish the same results, ranging from dead simple to prohibitively complex. If you have simple goals, you can still achieve them simplemindedly.
. . . And I think I now have a hypothesis about why so many rich folks seem like crooks.
That's the usual yardstick. Hence the expression, success breeds success.