Your comment makes it sound like BYD are using the labour directly. The article is about materials and improperly audited supply chains.

As that article points out, it’s currently not possible to tell how much is being used by each company. So, yes there’s likely a percentage of that aluminium used. As there probably is in your kitchen foil, and the aluminium in your phone.

Given that, only around 68% of aluminium is new (the rest being recycled) of that new aluminium, according to your article, around 9% is suspected to be affected.