I'll lay out my gripes with the portion of the essay that I read (could not finish that drivel).
1. We're talking about HS students. While the delusion of playing pro ball is real for many HS players, it's not real for those who can't even make the team...which is the vast majority of the school. In every other locale sports is used to build character and teach principles which can be applied in the real world. Steph may not have had it as hard as his students, but he can still tell relative tales of perseverance, dedication, hard work, and respecting those with more knowledge than him (coaches, teachers, parents, etc) even when he didn't want to. The students MAY not be able to make that logic leap to apply his words to their lives, but that's where you come in, teach!
2. His entire premise is built upon this flawed (in my opinion, and my experience) notion that the student athlete who is struggling with his grades is choosing bball over schoolwork. Often times that kid, like many of his peers who are not athletically gifted enough to make the team, doesn't like school and would struggle even if he got kicked off the team or blew out his knee and could never play again. On the contrary, sometimes it's his athletic prowess that grants him the extra attention in the classroom which can end up making a difference in his life.
3. And this is the point that many are either glossing over because you think this clown teacher is making valid points: none of this is Steph's doing. He's calling out, or namedropping Steph in a very attention whore-like manner. Not only is this not Steph's doing, those who are delusional about their bball chances are will be so with or without Steph speaking at their high school. Steph speaking would be far more likely to enlighten some young brother to the reality that a career in bball is far-fetched than it would be to turn some HS aged kid into believing in that dream all of a sudden....especially if there is a Q/A portion to his talk, where teach can steer the conversation.
Ultimately, I couldn't take this dude's tone anymore so I couldn't finish reading it.