Yes, I agreed that Washington was a great general not so much because of his victories but because of his brilliant strategic retreats.
This is because, during the American Revolution War, George Washington fought a total of 17 battles in which he won 6 (35 percent), lost 7 (41 percent), and had a draw 4 times (24 percent).
Also, Washington's biggest victory is considered to be the Battle of Trenton, which he won initially, he and his troops then retreated to come back and won finally a week later.
They defeated the Hessian mercenaries in that battle.
Hence, in this case, I agreed with the statement in the question.