He might have, he might have not. During similar (albeit more extreme) circumstances in the Rhineland in early 1945 he failed to follow basic military logic to withdraw over that river and use it as a natural barrier, but instead stood and fought as per Hitler's orders not to surrender a single yard of German territory. The result: his forces were crushed up against the Rhine and cut to pieces, costing the Wehrmacht nearly half a million men and shortening the war considerably.
OTOH, I don't think he really had a choice. The Nazi state had not yet collapsed, and they were literally fighting on German soil, not on the arse-end of nowhere, meaning Hitler would likely find out and countermand said orders pretty darn quickly. IIRC, Runstedt did argue for a withdrawal, but was rebuked by Hitler.