My best guess is, that this will trigger contracts that say: "supplier vows to abide by IP laws". The vendor that buys products from the supplier then just claims they didn't know about it (they really don't care). Then they testify (truthfully) that they did their due diligence and acted in good faith.
How do you want to sue someone when they act in good faith and have no knowings of what the supplier on the other half of the word is breaking the contract? Do you want to make supplier audits mandatory? Don't be ridiculous.
And if a law is passed that enables the suing of the companies when someone exposed the supplier, this opens a whole can of post factum liability worms.
The other thing is, that China is only vocal about IP laws, but the industry mostly depends on shallow enforcement. So I really doubt that it will be easy to expose suppliers if it has bad consequences for Chinese companies.