Sorry for being cynical, but they may be trying to take the eyes off an even worse number.
The major thing they left out of their diversity statistics is how many people are over the age of 40. It's pretty clear that ageism is pervasive in the tech sector - and the internet. Last time I mentioned this, there was a serious sneer response to my post saying that "old people" (i.e. people over 40) should be discriminated against, "because they have issues."
There you have it slashdot. You had better be looking over your shoulder! You aren't getting any younger!