If rule of law is to mean anything at all, all branches of government must take appropriate action to ensure that the law is followed.
A community college is a public institution. While it isn't responsible for enforcing immigration law, it is responsible for ensuring that its admissions standards and processes are compliant with that law.
The article above raises the issue of a scholarship, privately funded but publicly administered. The real issue is that illegal aliens are being admitted to public colleges in the first place.