And unfortunately, in my experience as both a university tutor back in the day, and now as a hiring manager for some candidates - international students, even those who studied at local universities - are by far the least qualified in all areas.
The international student game is a billion dollar industry that lines the pockets of university staff, allows constant round-the-year renovations of university facilities, and allows the universities to present themselves as "diverse and inclusive" learning environments.
The problem will never be solved as long as money is involved.