This is true, but precisely because it is true, at the top of every game everybody is reasonably hard working. And among these hard-working people other factors start to decide again, and a very important factor is talent.
So if you compare yourself to the guy who watches TV all day, of course hard work is the main thing. But if you compare yourself to fellow enterpreneurs, Phd studentst, hackers with great github repositories, or guys who work long hours at their workplace to advance, who maybe does not watch TV at all, talent matters.
At some point, you hit a region where access to capital and powerful friends is the difference, not talent. For example, Larry Page and Zuck had wealthy investors and access to enployees who were more talented than themselves but accepted a lower share in the conpanies they built.
So if you compare yourself to the guy who watches TV all day, of course hard work is the main thing. But if you compare yourself to fellow enterpreneurs, Phd studentst, hackers with great github repositories, or guys who work long hours at their workplace to advance, who maybe does not watch TV at all, talent matters.