Be wary of such claims, Iggy. I'm not up for checking imports on them right now, but in the past I've found that the reality was something like this:
Moldmaking shops spring up like mushrooms during good economic times. We soon have excess capacity. Then the downturn comes, and they drop like flies -- not only the new ones, but also some of the older ones that didn't keep up to date.
Then someone does a survey (AMBA, for example) that indicates that 30% of the business is going to China. Only they don't know how to do a survey, so it's screwed up beyond recognition because they're counting the same lost contract three, four, or even five times. So then you check with Commerce for their import data and you find that it's impossibly skewed, because they counted a lot of molds as "materials."
So then you spend a month figuring out the reality on your own, and you realize that there isn't nearly as much of that business coming from China as imported molds. What's actually happening is that the business is coming from China as imported *finished products.* They're getting their molds made at home.