France is 674,843 square kilometers. The surface area of the Earth is 510,072,000 square kilometers. This is more than 750 times as big. The distortion in France only, in the
polar azimuthal equidistant projection, is very low. I can't see it visibly with my eye. I suppose it all depends on whether you're denying the existence the inertia problem, that a circumnavigation of the world is a circle.
Anywho, Pongo had a mean tone, so that's a personal attack, so everything he said is wrong anyway, so it's all irrelevant anyway. I don't know why I'm even arguing it.
As for the false premise thing, here's an idiot-proof (hopefully) example:
1. I am immortal (false premise).
2. I cannot die.
3. If I jump off a cliff, I won't die.
So, what if someone says, "I'll give you five dollars if you jump off that cliff!" So I do it. But, my premise, that I am immortal, was false, so the conclusion, that jumping off a cliff won't kill me, was also false! Imagine that! Starting with a false premise led to a false conclusion. I actually will die if I jump off a cliff, unfortunately.