Which means you have no proof to the contrary, got it.You are using that quote to support the assertion that the French government knew when they started mobilising (or when Russia started mobilising) that war was inevitable.
I would respectfully suggest the burden of proof lies with you.
I would merely suggest that if you agree on something with your primary ally, it stays in effect until you either explicitly rescind it or agree on something different. I can't imagine such a central point just fading away with time. So unless I find some more recent agreement to the contrary, I have to assume the initial understanding between the two allies was still valid in 1914. If you now claim that there was actually a change in policy, then I believe the burden to prove that is on you. Otherwise, I would have to prove the non-existence of such evidence, which is very difficult indeed.