no, china had nothing to do with it, they were Taiwanese manufacturers.
an Japanese employee stole an electrolyte formula and sold it to the Taiwanese but he did not give them the right formula.
a much bigger problem, one which has cost much more is ROHS solder this is so serious that the dod has started another “Manhattan project” in order to solve it.
Yes, I heard that Texas Instruments spent millions converting all of it's chip assembly plants to be lead free.
When they finished the total world wide savings was in the order of the lead content in six car batteries.
In the UK I watched workers on the tile roof of my cousin's house. They were using lead flashing. I asked if this was still legal and she said you can just buy it by the pound in the home supply store.
So micrograms in electronic components get removed, but still used by the pound on a roof - the EU in action...:^)