I doubt this advancement came without intellectual property theft. AMD, INTEL, IBM need to do their due diligence.
I'm not saying there was no IP theft involved. However, you'd do well to keep in mind that most/all US technology companies have/had semiconductor design offices in China. Many (such as AMD and Nvidia) have been there for more than a decade. So, whether it happened by way of forced technology transfer or merely short-sighted US tech companies looking for low-cost skilled labor, not all of the needed expertise was attained by theft.
Also, China has been massively investing in the semiconductor sector, at all levels. From academic research to manufacturing and design. Even without any theft, it was probably only a matter of time that they would catch up.
Going forward, IP theft should definitely be an area of concern, but that can be hard to enforce. Anti-dumping measures are another angle that
should be easier to enforce, and will be critical to a future with viable non-Chinese competitors, in the semiconductor sector.