The phase 1 US-China trade deal can be rescinded anytime. Why?

https://sg.finance.yahoo.com/news/chinas-liu-says-u-achieve-140439672.html

It is extremely difficult to execute the phase 1 trade deal because the targets set are simply unrealistic.  There is no way for China to buy a total of US$200B worth of goods and services when the US doesn't want to sell high technology goods and services to China.  Furthermore, China has to cut back its purchases from developing economies substantially so that China can buy from the US.  This will result in those badly affected developing economies to lodge formal complaints to WTO for US preferential treatment.

Therefore, I am not optimistic about the execution of the phase 1 trade deal.

http://sg-stock.blogspot.com/2019/04/many-countries-are-fearful-of-upcoming.html

http://sg-stock.blogspot.com/2019/12/the-15-dec-tariffs-between-us-china-are.html