To that I say get them on a launch monitor and prove it. Their high scores are enough for me to doubt it, nobody hits a driver better than a short iron, nobody. In seriousness I take these claims with a grain of salt every time. We all remember the "why doesn't anyone believe I can drive it 300" thread. When that guy got back from the launch monitor he came crashing out of the clouds back to earth. He hit something like two balls out of a hundred just over 300. The rest significantly shorter and in every direction. I think he averaged around 235 during that session and while he had the stones to post results he didn't hang around long after that. Pretty sure when it was said and done he still didn't want to swallow the results saying he would have performed better with a little more time, said he was just warming up.
This is kind of irrelevant, because there are always those two shots you don't want to make strictly for safety purposes.
I agree that many people overestimate their distances. I was just having a conversation about driving distances, and the google earth distances show one value while the "gut" told them another. 250 yards is a really long way out there. Agreed.