This was discovered through the supplier transparency reports that Apple provides. Apple tells suppliers what they expect, and then when they audit the supplier

This was discovered through the supplier transparency reports that Apple provides. Apple tells suppliers what they expect, and then when they audit the supplier they report the findings and work with supplier to clean up their act. In this case the the supplier violated child labor policies in what looks like 2 successive audits 3 months apart. The Information is taking the position that Apple should have immediately dropped the supplier instead of continuing with them. It is written in a way that sounds like the supplier was out of compliance for three years, but we are not told. It should be in the transparency reports.