The Great Firewall of China is not so great, afterall

I would assume that they're using deep packet inspection as weel, but not to fully ban, but simply to slower down users internet when they're using VPN.

Have you tried to measure traffic from your china server while browsing with and without VPN?

From my understanding, speaking with the author the GFW is more adept at content screening. This means that it was the content on Mysterium Network's website that led to the domain mysterium.network becoming something that was flagged.

This is something that the Mysterium core team is able to (and are going to) change, so access to Mysterium dVPN in China will be coming soon!

In our case yes, China users was successfully connecting to simple Openvpn servers for 2 years. And we did not do any sophisticated transport all this time.