You overstate the role of TW. The Taiwanese are a major player on the mainland but you should not oversee the roles of the West with the Germans making huge investments in China. The contributions of the Koreans, the Japanese etc. the sanctions imposed after 1989's Tiananmen Square are mostly related to military hardware.
No, I am exactly right. There is a long list of Taiwanese technological transfers to China.
The South Koreans and Japanese would never help China industrialize.
South Korea's Samsung manufactures simplistic memory chips on mainland China. It does not manufacture advanced logic chips. Only Taiwan's TSMC does that.
Fifteen years ago, China offered free land and electricity to Toyota for a car manufacturing plant. Toyota said no.
The South Koreans and Japanese only bring in technology to China after Taiwan has introduced it. There is no gain to China when Taiwanese technology is already present. South Korea and Japan would never help their competitor China to advance technologically. It would be suicidal economically for South Korea and Japan. China has enormous scale. If South Korea or Japan helped China technologically, they would drive themselves out of business.
The claim that South Korea and Japan helped China industrialize is inherently stupid. Koreans and Japanese are very tight-fisted with their technological know-how. Both South Korea and Japan are tiny countries and their survival depends on having a technological advantage. This does not apply to Taiwan, because Taiwanese see themselves as ethnically Chinese. Transferring technology to other ethnic Chinese is logical.
South Korea and Japan have to listen to the United States. The United States would never allow South Korea and Japan to help China advance technologically. Many of the South Korean and Japanese technologies are licensed from the United States and cannot be transferred into China without an explicit export license from the United States government.
In contrast, Taiwan transfers whatever it feels like. The technology belongs to Taiwan. Taiwan innovated all of the improvements to notebook computers and has a dominant 90% worldwide market share.
One million to two million Taiwanese are still working on mainland China today. The army of Taiwanese experts and engineers were the bedrock of China's industrialization.
The number of South Koreans and Japanese in China is trivial.
Taiwan brought a mountain of technology into China. None of it was South Korean or Japanese.
Taiwan's long list of technological transfers to China: Digital camera manufacture, notebook computers, machine tools, solar panels, LCD displays, LEDs, specialty chemicals, 3G and 4G broadband cellular network technology, logic-chip technology, and plenty others (such as Taiwan's Andes Technology CPU design).
It's all Taiwan.