A 1944 study of the problems of post-World War I disarmament of Germany stressed the impossibility of disarmament-by-inspectors when the government to be disarmed is uncooperative. After 1918 the inspectors' greatest difficulty was procuring reliable data because the German government connived at concealment. This difficulty ``could have been surmounted only by a complete and prolonged military occupation.''
That's just the conclusion. Read the evidence.
As an aside, the line "Months would be necessary to prepare a new war, and do you think the French would look on with their hands in their pockets?" reminds me of a joke I saw not long ago:
How many Frenchmen does it take to defend Paris? Nobody knows.