I disagree that the statement is useless, but here's some more info for you. I use China Telecom and China Mobile. Haven't tried China Unicom.
ExpressVPN has a message on most of their apps saying to use Tokyo 1, HK 4 or 5, Los Angeles 5, or UK Wembley when in China. I have used all of those servers, although HK 4 and 5 are the fastest.
I've used Shadowsocks and ShadowsocksR for my VPS. Switching ports will work for a while, but I've always found the server will get blocked eventually, possibly due to "active probing" as defined in this paper[1].
This person[2] suggests hosting a website from your Shadowsocks server as a cover, but I haven't tried it yet.
[1]https://conferences.sigcomm.org/imc/2015/papers/p445.pdf
[2]https://medium.com/@phoebecross/bypass-gfw-china-2019-dc5959...
Are you in Beijing or Shanghai? Are you on China Telecom or China Mobile? Are you using the Sweden 2 or the Hongkong 3 server? Every permutation of those variables can have a different answer, and that answer can change from day-to-day.
My experience is that in southern provinces and bigger cities it is _more likely_ to work at any given time. But things change.
> However, self-hosted is much faster still. Unfortunately, it's less reliable.
Using a CN2 VPS is definitely a :racecar: in my experience. I primarily use shadowsocks instead of a proper VPN because moving to a different port when the interference starts is usually sufficient.