Now that actual journalists are breaking this down, it’s becoming clear that someone provided previously-undisclosed information about the party’s attendees to Whelan as part of this smoke screen:
(Note that because it only includes the thumbnail of the photo in Whelan’s tweet, this screenshot crops out the location of the female classmate’s house on the map; the image is reproduced in full in the BB article, though.)
The best case scenario is “someone on the Judiciary Committee leaked non-public information to someone building a disinformation campaign to discredit a sexual assault allegation”. Anything less than that best case scenario pretty much implicates Kavanaugh by default. That person’s identity had to come from somewhere, and the committee obviously hasn’t gotten it from Ford. Which means that if the person didn’t privately come forward to the committee herself (prompted by press inquiries), it either came from Kavanaugh or Judge, which betrays their protestations that they knew nothing about the party in question.