Thats just being humble. Most successful people think its that way because they are special and worked hard. Wrong. Most people work hard, its the LUCK many underestimate. Being aware of this is healthy in so many ways, especially socially.
"Is Success Luck or Hard Work?"
On the flip side, ascribing success entirely to luck is not at all healthy. I see lots of people who complain about their lot in life but then do nothing to change the trajectory.
(Disclaimer: there may be confounding variables the study didn't account for)
Maybe some amount of good luck could do the trick...
Sure, if his parents divorced and had he joined a street gang, it would have been harder for him to get where he is.
Everything is luck.