I can't tell how this would work, given that the URL in the screenshot uses https for the website (yes the .ac.jp one). GFW is powerful, but it can't just do MITM however it wants. Most of what it does these days is blocking based on known domain names/IP addresses/traffic pattern, not magically reading E2E encrypted content, for a single page out of a domain. If there is a problem with the content, with https, the entire domain gets blocked (which is a bigger problem), not just that single page of the site. GFW doesn't even know which page you are reading.
It might be true back in the day when most of the traffic is in HTTP, and Wikipedia pages would be blocked simply based on the URL which contains the page title. But this story just doesn't make any sense.
PS: The article says "That means there’s a strong possibility that the admissions page wouldn’t load for Chinese students ..." it either loads or doesn't load, which is very easy to verify. But all it says is "strong possibility". What kind of nonsense is this? If you want to write about this topic, use some concrete evidence to prove that.
To people who downvote me: provide your technical analysis instead of just disagreeing like a coward