That's awfully naive. China's cyber units or state actors most likely have access to Wikipedia and are not bothered by the Great Firewall. The citizens on the other hand, I agree with you.

Citizens do/can have access to Wikipedia, that's also very naive, estimations range from 15-35% of the population using VPN but in practice, any IT business and all their staff are behind VPNs and it's completely tolerated.

Almost all street markets sell those USB/QRcode to access unrestricted internet.

Most people don't need a VPN as well, similarly to the US population not accessing much of the content from let say Austria, France, Germany... due to language barrier or just not caring at all.