Trade dispute resolutions are not legally binding. The judgements are to be implemented or ignored by the sovereign governments that are party to the agreement. If the US Congress ratifies a trade deal, they are saying they will abide by whatever type of dispute resolution is in the deal. If a judgement is made against them, they can comply in the interest of remaining party to the deal or reneg on the whole thing and lose the costs and benefits. Same as signing a peace deal with anither country. We can start shooting again whenever we want but it just means they will shoot back. Sovereignty is at never violating.