What complete and utter bullshit.
95% of 250 coders. That means that out of a million programmers they will misidentify 200000.
You know it's not a contest to come up with the worst bullshit. If you're left with one person 95% of the time when you have 249 possible wrong answers, it's like being left with 4000 people when you have 999999 wrong answers. If all those are too close to tell apart you'll misidentify >99.9%.
Imagine for example that you wanted to find people by height and weight, as measured to nearest cm and kilo. It might work decently on a small group, but if you scale it up to a million people there'll be a lot of duplicates and then you're just guessing, double the population and you halve the chance of being right.