

From the article, it sounds like TSMC’s part in this was just negligence as Huawei used a front company to make the order for them — like a 14-year-old getting an adult to make a booze purchase. If they get fined, it seems unlikely it would be for the maximum amount.
They use US tech in their foundries, and thus are subject to export controls to make sure sanctioned entities (like Huawei) don’t benefit from it.