You have anything resembling evidence the Liberators were effective against the Germany Army? Did they drive them out of France? Did they even seriously impede their operations?
I seem to recall the French Resistance being pretty ineffective militarily, even when using weapons considerably more powerful.
In fact, I believe a rather large actual army, several in fact, was required to defeat the German Army.
Oh, okay. Well, you will need to tell a lot of people and authors. These researchers and historians are sadly mistaken, and you need to let them know!
Just a few quick examples for you to get busy on:
“Did they even seriously impede their operations?”
Yes, they did. The Normandy invasion didn’t meet enough resistance to stop it because the French ensured the Germans were delayed. To be dismissive of the French Resistance is trivializing their lives lost for the affects they did have and we were grateful to have had.