I thought it was already well established that anything you buy from China has some level of child/slave labor attached to it. Most people see it as an externality.
If you care about slave labor, buying Apple would be one of your mitigations. They have extensive outside review of their supply chain practices, reported on regularly.
Your risks are more smaller companies that the media hasn’t put through the ringer. And Samsung, which got caught using prison labor.
How many people do we think would choose not to buy a smartphone made in China this year, if they knew the supply chain used slavery. Sadly, I don't think people care - as long as they get the latest iPhone... (maybe why I am being downvoted?)