The actual legal code conforming to treaty requirements is a matter for countries to write and adopt, but generally that's occurred.
So, disagreement in part with your categorisation of WIPO/Berne as "guidelines", which I feel grossly understates their status.
China is a member of WIPO: https://www.wipo.int/members/en/
The Berne Convention of 1971 (I'm fairly certain this is supersceded in at least part) does not appear to include authorship or originality in its properties of covered works:
The expression "literary and artistic works" shall include every production in the literary, scientific and artistic domain...
Though article 3 provides that protections apply to "authors":