When Ney opted to support Napoleon, France was not at war with anyone, so 'desertion in the face of the enemy' is hardly applicable.
And if you insist on that 'definition' then Louis, his get, and their entourage certainly would figure into that definition because it is they who deserted Paris and ran for Belgium.
The Bourbons were petty, cowardly, and unfit to rule anything or anywhere. And their 'vengeance' against Napoleon's supporters when they came back 'in the allies' baggage wagons' contrasts sharply with Napoleon's attitude and actions when he returned from Elba.