[gamedori]

This seems to be a relatively simple case of tit-for-tat. Chinese scholars were welcomed in the US, but a significant minority of them have abused their welcome (defected). It is not all of them, but it was systemic enough to lose a lot of the US technological edge. In order to cut its losses, the US is now defecting on educating those students and researchers. You may say this is very unfair to the students, but in Chinese culture it is not uncommon to punish the family members for crimes of their relative.

[gamedori]

Actually, having read the Science Advances article, it seems simpler than this. Institutions are being asked to warn their foreign researchers (not just Chinese) to be open about other contracts and commitments,and firing those who are deceitful. Seems to be a very clear case of breach of contract being remedied.