On page 8, the company states that the "Supplier shall ensure that all work is voluntary. Supplier shall not traffic persons or use any form of slave, forced, bonded, indentured,or prison labor." This text clearly shows that the cooperation is acknowledging the fact that they do not stand for forced labor.
On apples home page there is a section title "Apple Values"
The section includes
Inclusion and Diversity
Racial Equity and Justice
A link to their modern slavery statement can be found under Supplier Responsibility