He never claimed it was. More importantly, he is providing a data point, whereas the original claim did not provide anything to back it up.
Mentioning the word luck draws it in a different light, as if next time the odds might be on their end. Luck is meaningless if there's enough skill. Its an overused (if not downright abused) word.
Not to be blunt, but your perspective on Google employees is irrelevant in the context of how they're perceived by the broader market. I think that's why your other comment is being downvoted; it seems like what you're saying isn't wrong per se, it's just inconsequential to the job prospects Google employees actually have. Even though you're a hiring manager and don't personally consider Google employment to be a plus, most other hiring managers really do.