I am not at all up-do-date on these types of current events, so this will probably be completely ignorant, but as a practical matter, I’d wonder how China could pull Chinese students located in other countries against their will - and the will of their presumably wealthy (and politically connected) families in China. Is there a financial route, such as Chinese banks not transferring funds to foreign universities? Otherwise, this sounds like hot air, like the people it would hurt most are the Chinese students, i.e. cutting off one’s nose to spite one’s face.