On that basis, what matters is whether China is following the rules it, and everyone else, agreed to. If you think some one is cheating you arbitrate. We made a deal.
Trump is intent on blatantly breaking the rules the US has agreed to, and breaking the deals it committed to. That is important because companies invest billions of dollars based on the rules countries agree on trade. Arbitrarily change the rules with no warning and those billions of dollars of investment can become worthless and the jobs associated with them lost in Canada, the EU and countries all over the world aside from China.