The alternate leaderboard is now off-line. It was originally built to show my club mates that attempting to place high up on very short segments was more down to GPS error than their actual speed and it kind of managed to do that. It was only accurate for a very few, specific types of segment and beyond that was soon subject to far more error than Strava's own leaderboard.
For more information on what it was about then read this blog post.
It also came in handy for the rebuttal to the Sunday Times article but the data on that segment was so wildly inaccurate that it only showed how less useful the alternate leaderboard could be: 41 mph? The Evidence Against the Sunday Times Article