The entire point of the trade deal was for Trump to revert US China policy to more normal obama/bush era type relations- needless to say, trump and his racist buddies violated both the spirit and the letter of the trade deal.
So what was China suppose to get from the phase one deal for them to say China didn't live up to their end to suggest the US lived up to their end? Relief from tariffs? Cease fire from tariffs? Trump actually took more actions against China during phase one and yet China somehow didn't honor their end of the deal...
After the Phase 1 death was signed and done, COVID-19 happened and Pottinger took it upon himself to drag the US into a new cold war with China; the rest is history.