I don't think hitting 10 of 12 fairways is that outlandish. I've had days where I was hitting my driver perfectly all day (of course the other clubs weren't working) and I'm sure I've done that before. I've seen my uncle that accurate before. One must remember when comparing these claims to PGA standards is that for myself a) I'm not driving it as far as they are so I have more margin for error when hitting the fairway and b) I'm not playing the courses and conditions they are playing so typically I have wider fairways that are easier to hit. Hitting 10 of 12 fairways is not a common occurrence (at least for me), but not something that I'd think was outlandish if told by someone else that they did it before.