The obfuscation guide you linked to does not have official blessing from the project, but it seems to have useful content. Note that we don't generally distinguish between official and unofficial documentation.Do OpenVPN developers have an official wiki on how to use obfsproxy with OpenVPN? Or is the article referenced by the following URL--https://community.openvpn.net/openvpn/wiki/TrafficObfuscation--your official guide?
Samuli