Except that isnt what was said what was said is that the United States will reject any peace treaty that does not include total Russian withdrawal, they are not just giving support in general, or to a point in particular, but dictating a term. This is a conflict that offically the US is not a party to and as such the US should not be making statements like this. Agian in my opinion it should not go farther than “The United States supports Ukraine in their efforrs for peace, and for all reasonable terms they put forward” if they go farther and they wanted to show it in support it would have been “As stated before, The United States suports the Ukrainian position, including the one mentioned by [offical X] on [Day y] that any peace would include total Russian withdrawl” given nither happened, it can only be taken as the US dictating terms for a thing that they have no buisness or right setting terms for