If you had read something about Apple being "extremely vigilant" about eliminating child labor, it was a press release from Apple. It was a bald-faced lie, but it apparently worked, because you're unfortunately perpetuating it (even if unintentionally so).
In reality, Apple has only started to address child labor in the past two years, and that was after being exposed for their continued egregious use of child labor and unwavering support of labor abuses.