"As a result of these discussions, the United States and Mexico commit to:"
"... those crossing the U.S. Southern Border to seek asylum will be rapidly returned to Mexico where they may await the adjudication of their asylum claims."
This part puts control of the border back into US hands, because no matter what Mexico does or doesn't do about enforcement provision, THE US IS ALLOWED TURN THEM AROUND AT THE BORDER BACK INTO MEXICO.
Notice it says "commit to" as the actual agreement would be worded -- and not "committed to" as a 2nd hand report of the agreement would be worded.
“THE US IS ALLOWED TURN THEM AROUND AT THE BORDER BACK INTO MEXICO.”
But once they set foot on US soil, US law says we cannot.