I think you're completely misunderstanding the incentives for Apple here. The theory is they don't want to deal with doing anything about forced labour, because evil, therefore their changes must be to water down the legislation.

That's not the situation though. They already have a forced labour policy, already do supply chain audits and have even already dumped suppliers for violating these policies. Their actual proposed changes really are just to make the legislation clearer and more enforceable. The reason is because then everybody else would also have to do what Apple already does, and face the costs and accountability the same way Apple does. This legislation is a windfall for them because it creates an expensive moat that it's hard for their competitors to cross.