>actually kind of brilliant
...
>what's the motive here
It's smooth brain stupid, like comments posting Tiananmen copypastas on reddit or youtube thinking it would kick out PRC users, who are on those sites in the first place because they're already using VPN to jump over the GFW. Ditto with PRC cohorts who applies to study abroad, who will invariably have VPN access and just switch on if a admissions page times out.
Like ~50% of Japan's international students are from PRC, and this is University of Tokyo who from anecdotes is very friendly to PRC applicants, and have one of the largest international student bodies in general. Quick search online Tokyo University has 4968 international students, 3232 is from PRC, or 65%, substantially higher than JP average, which is way more than I thought. So it's likely just some disgruntled racist who thought it was this one neat trick to block the chicoms, otherwise if it's formal policy, admissions could always just lowkey reduce PRC admission without any overt evidence and prevent drama.