I suppose the author Jean-Luc Aufranc can access Chinese because he linked to a most fascinating account of the development process https://www.zhihu.com/question/466393646/answer/1955410750
The key to getting where they are is commitment to developing design flow and tools that allow for fast iteration to explore and verify design changes.
Bit fascinating that there have been more information of Chinese tech in German than English. German's wikipedia entry for Chinese space program has more information than the English one.
