Sure it is. R’ Willig is your strawman, since he is the posek who authorized the Prenup.
How would the RCA be involved with the Conservative Movement? Your insinuation is that people affiliated with YU are somehow inclined towards that perspective, when they are the finest of the finest in Orthodoxy. R’ Schachter, R’ Willig, and all of the great rebbeim at YU are gedolim of the highest caliber.
And the text of that prenup is borrowed largely from Nachlas Shiva.