It's a concern about Chinese stainless having unacceptable levels of Pb and Hg.
Totally understand where you're coming from. Chinese steel (especially Stainless) has suffered from quality control issues in the past. Usually producers with low quality steel don't last long in the industry. Like you said before American companies can still make products here with Chinese steel so its a lot tougher to figure out where the metal is actually produced.
Like Hal said, vintage stuff can be a good bet or items made in Europe or Japan that usually produces better quality 304.
At the end of the day, I'm personally concerned with concentrations of Mercury in the fish I eat rather than the stainless steel it's cooked on. My Korean friend told me years ago that he never buys any seafood/food products from China. He'll buy from Taiwan, Japan, Korea, Vietnam....but he told me to always pass if it's made in China. That's always stuck with me.