They can flip flop again after the 20th. Who cares.
The shares of these three companies traded on NYSE are a small percentage of the total shares traded. Those investors wanting to continue to hold the stocks have been selling their holdings in NYSE and swapping them with those in HKSE.
The Trump government has done tremendous and long-lasting damages to the reputation of the US, its market, financial systems and high-tech industry. I don't recall the US has ever lost its calm and cool in such ways. It takes a competitor and rival of China to cause such panic and shoot in its foot. It's rather sad.