No, in fact, they did not. That peculiarity has been the reason so many have been looking for a cause for so many years, and why the blame has been put on mythical, nearly superhuman hunters.
Not to mention that almost all of the mammoth slayer stories seem to depend on this “cliff” that they somehow force the mammoth over.
I’ve been to the midwest, the Great Plains. There are places there where the nearest “cliff” big enough to stun a mammoth is probably more than 100 miles away!
Why do they have to be superhuman? Simply being human is enough. If we set our minds to killing something, we are going to find a way to do it, that’s the human spirit.
Can we kill it with an arrow? Nope. How about a spear? Nope. Hey, let’s scare it with fire until it runs in that box canyon, then Ugg and Nodar can push boulders off the cliff onto its head!
You of all people should know better than to underestimate what ancient humans were capable of dreaming up, man!