So you admit, you're making an appeal to (lack of) authority. And it is based on his profession, or you wouldn't have brought up his profession while attempting to discredit his thoughts.
If you feel like you can identify with Kobe Bryant to the point of finding his work/life advice useful, go ahead. I don't. I find it misleading. I find it harmful. He is far from being the top thinker on this matter. He is not Bertrand Russel talking "In Praise of Idleness". He is irrelevant.
Reread the quote again. He wasn't giving advice. He was explaining his own mentality. You jumped the gun and started criticizing him as if he is proselytizing on the streets.
If there are any criticisms to be had about what Kobe said, they could be made in good faith without an unnecessary mention of his career as a limiting factor of his experience.
Also, it is not the uniqueness of his skills that makes his wisdom questionably applicable on this matter. It is the totality of his life circumstances being radically different. Having enormous financial, social and athletic capital makes his situation very very divergent from practically everyone else’s. And it is not his wisdom about romantic relationships, how to be a father etc we’re questioning, it is about working at the expense of a balanced life, from a person who has a very special kind of work.