Given he's sticking around per the article to lead some teams, I expect what he did was "expressed an interest in retiring" and they're trying to create a path to ease concern: "Maestri will continue to lead teams focusing on IT, security and real estate development, Apple said."
He's 60 and has a nine figure net worth, some people actually want to retire or do other things.
Apple has ~a hundred billion cash in hand, that is exceptional performance for a CFO. He's giving a SIX month notice, the VP of finance will take his place, which literally is the natural successor.
Absolutely nothing here may suggest there's incompetence or a scandal involved.
