Trump has used the trade war as a bargain chip
Say you implement a tariff of 20% on products. Now you have things to bring to the table in future discussions and not just on trade
So he can make a deal and say he will reduce the tariff to 10%. And he's still 'ahead' because previously there was no tariff at all.
I think it's what he did with Taiwan too, recognizing them as sovereign. Would obviously piss China off. Later he can negotiate with China and say he will recognise Taiwan as a part of China. That's been the case for decades so America hasn't 'lost' anything' by 'conceding' should he choose to. America didn't have much on the table before to make a deal or negotiate. By doing all this, there are now many things on the table and puts America in a position where it can call the shots
Now that an election is coming up (as well as the sham impeachment trial) he will promote how great he is by reducing the tariffs, lightening the trade war, restoring confidence, plugging the stock market and economy all the while pretending he's the deal maker and pulling China into line at the same time.