Back when we were college students, he wasn't rich. Yet he got through med school (med school!). He asked friends like me to check things, when they mattered.

You keep looking for excuses, not solutions. He knew, and knows, he has a problem with spelling. So he does everything he can to get the help he needs to keep his spelling from limiting his career. He did it when he was a poor college student. Now, he can get secretaries to check, because he has a successful career built around his strengths, rather than letting his limitations define him.