The article is a bit exaggerated, but it does have some true points. Some other things to consider
First of all, the vast majority of Chinese students want to stay in the USA, work here, and become citizens
Also, Chinese Communists are suspicious of any students or people who have remained outside for so long. Its both jealously of the people within the bureaucracy, and fear of ideological pollution.
“First of all, the vast majority of Chinese students want to stay in the USA, work here, and become citizens”
But how many of those citizens are actually moles sending data back to China?