President Dumbo is just doing his theater act, he saw the stock market react badly to his tarriffs and quickly "made a token deal" to make it look like he's doing something as if this is a reality TV game show and people are too stupid to see through the act.
He knows full well he can't do anything to bring down inflation in the US, this is all a side show to distract from that. Pissing off allies though is probably not the smartest way to go given in the next decade+. The US is going to need all the friends they can get as China makes moves to cement itself as the new global superpower and is making headway with alliances like BRICS. Probably not very smart to start shitting on long standing alliances you have as it's one major advantage the US has had over China, the next president is likely going to a lot of work to do repairing all this shit.