I wish we keep survivor bias in mind when reading success stories; we should ask "out of those who work hard and gritty, how many are successful and how many are actually not?" And not "out of those who are successful, how many are hardworking?"
Most of the time, hardwork is just the minimum prerequisite to success that every aspirants have, de-emphasizing the role of luck in life is simply unwise.
If you're talking about cases of extraordinary success like this person, then hard work can vastly increase the amount of opportunity you're exposed to. Nobody says luck isn't involved, but you can improve your odds of getting lucky.
The "luck theory" is the one that is damaging. Because the biggest real problem is people don't know about opportunities. This is one big advantage certain immigrant groups have over even locals. They have networks of people from their country telling them where to go, what skills to get, what jobs to get, how to deal with every detail of every hurdle. It's practically a mentoring system for how to succeed in the US.