Currently, Skeptics' Area51 page claims that:
241 users committed
4.6% signed up for beta
0% fulfilled commitment
173 users followed
1.7% signed up for beta
That does not add up. There are 127 registered users on Skeptics. Even if you remove the users who did not commit (Jeff, Rebecca, Geoff, etc.), you still end up with far more than the tiny portion of users who allegedly signed up for beta.
It doesn't look like it's a problem of simply outdated information. Yesterday, around this time of the day, there were at least 107 registered users. So, unless it's not updated daily, that can't be the problem. Moreover, if it's updated daily at 0 UTC like practically everything else in SEN, then it should be off by only two users (only Trish Hann and Dori signed up for beta since yesterday).