It does sound very strange. What kind of anti-China content would ever help a student's application process? Most of the application documents are about things like English language competency, visa requirements and prior qualifications, not political opinions.

Topics too hot for the public! I reckon it's probably more overreaction by the CCP. They are certainly a dramatic bunch.

It is saying that the intermediary who compiled the student's application added content that the student didn't sumbit:

The person in charge, “Xiao Rui”, told Zhang that a certain country’s tertiary institution had opened a “green channel” for Chinese students who intend to study abroad.

“Xiao Rui” claimed that the application documents needed to be “properly polished” to increase the chances of admission. Instead, the documents ended up being “implanted” with large amounts of false content containing anti-China prejudice and reactionary political speeches, said the ministry.

“Without his knowledge, Zhang went from a student with a simple resume to an anti-China ‘vanguard’ - a victim of this overseas study agency’s illegal behaviour,” the ministry noted.