Nope, not disingenuous :-). Yes, I had unusual mathematical potential, but many of those who do don't realize it, and even those who have average mathematical ability could learn much better.

Based on the Less Wrong survey results, my IQ isn't substantially higher than the average LWer's, but I know a lot more math than the average LWer. Whether or not this is significant is in part a value judgment, but my story is relevant to those who would like to improve their mathematical knowledge and ability.