> So you're not even sure what the problem is, but you're okay with banning it?

They are claiming that those students are under-qualified either way. They only don’t know if they are “gaming the system” or it’s just a regular failure of the system.

> A standardized English test doesn't seem too hard to administer

I’ve seen a lot of claims of rampant cheating in China. Perhaps gp who doesn’t seem to have a high opinion of Chinese students would worry about cheating in a standardized test?