This blueprint will make China lead/dominate in many technology-based high end products in the world. It doesn't change the current employment. It's about future. It's about future technology jobs.
Another reason is economic reason: money loss, due to technology transfer. This may not be directly linked to job loss. The issue is China doesn't have many laws on this. It depends on individual projects between one china company and one American company. The trick is here. In practices, all China companies use same approach regarding to technology transfer when they deal with American companies. (The individual American companies are short-sighted, they are only responsible for shareholders). At the end, they all individually are defeated in term of tech transfer. So, now Trump admin are asking China to make laws. Every party follow the laws in their individual negotiations.