After inquiring about official website, I learned that this is a private enterprise, not a state-owned enterprise.

State-owned enterprises refer to wholly state-owned enterprises, wholly state-owned companies and state-owned capital holding companies that the State Council and local people's governments perform the responsibilities of investors on behalf of the country respectively, including enterprises at the same level and enterprises formed by investment step by step under the supervision of central and local state-owned assets supervision and administration institutions and other departments.