There is probably little to nothing specifically Chinese about workaholism as a concept, but the word is definitely Chinese(as in language). Dialect continuum for East Asian languages are contained within borders, or in other words, each of the languages expanded and dominated to the full extents of continuum and hit with stagnation at major geographical features before entering the modern era.

At least the recent popularity of the 996 originated in China, and I believe most Chinese people would agree with that. Besides, even if it started in Hong Kong, saying it originated in China is still technically correct.

Investment banks in Hong Kong were almost exclusively western back in the days with very few ethnic Chinese in senior management.

China is the birthplace of the term 996. Of course it's not the birthplace of people being coerced into unhealthy work hours - that's been around for thousands of years.