"With this position, Apple uses its outsized buying power to squeeze the margins of its suppliers such as Foxconn, leading to poor pay and terrible working conditions in Chinese factories."
So Foxconn is either choosing to not do business with Apple's competitors who would pay more (??), or the competitors can't place orders of the magnitude that Apple can and Foxconn workforce would just be smaller with a lot less people being employed.
The intellectual dishonesty in the argumentation is so bad that I'm pretty sure I'll skip future Matt Stoller articles.