My guess the negotiators had somehow the information that the tariffs will soon be declared illegal so would be smart to let the narcisist think he won, I hope I am right and there is still rule of law in USA.
>The negotiators agreed to demands under threat of tariffs that they believed would soon disappear? That makes no sense.
It buys time, the negotiators also have no power to force each country to implement the stuff , or make the agreement some law.
It would make sense to assume illegal tariffs will be declared illegal with 95% of the chance and just buy time and let the nariisit idiot think he won and go ahead and fuck with someone else for now.