Would they actually know that after France's butt-kicking in the Napoleonic Wars, though?
Yes. The Coalition knew very well that France was too powerful to be destroyed for good which is why the 1790 borders were the chosen as that way the coalition kept France out of the Rhine and Antwerp without antagonizing them to the point of expecting a new war against France. Metternich actually wanted France to have the 97 borders but no one wanted France on the Rhine and the 90 borders were the ones that pleased everyone.