That excerpt was taken from a midnight update (Eastern time USA), that takes a gander at Asia markets at the time (marketwatch.com)
Sometimes it's a predictor for how TSM ADR's might perform at the open in the USA.
If news suddenly comes out when Taiwan markets are closed, then the US reacts and Taiwan follows. If news comes out when Taiwan markets are open, then Taiwan reacts and the US follows. Gets very bizarre.
TSM bought in Taiwan must be sold in Taiwan, not in the US. TSM ADR can be sold in the international market where the demand to supply ratio is higher.
Even the same TSM ADR most likely will be sold much less in the after-hour market here in the US and must be paid much more to buy the same in the after-hour market.
It is matter of demand and supply, imho.
TSM and UMC are winners everyday, everyweek, and everyyear as long as integrated circuits are needed for computer, communications, signal processing, appliance, networking,... and whatever and whereever electronic market is hot.
Even more is that the IC foundry industry is capital intensive business, the bigger onee make most of the money and can afford to upgrade equipment to attract more orders and make even more money. It is very difficult for small guys (even big boys like IBM, Intc) with or without deep pockets to enter this business, imho.