WTF. How are you going to allude to the damning rumor and then not even tell us what the fukk it was???
I'm still leaning toward Adnan being guilty.
I think she straddled the line. I think her original intention was to tell the rumor. Once the show started catching up to real time, or real time started catching up to the show, and she got the huge revelation in October, I think she decided it might not be ethical to state the rumor. Something like that. Plans changed. But since people online (reddit) already knew some rumors, I think she had to address the fact that there was a big one.
Plus she also might have to worry about libel at this point if it's not true, especially with how much attention is on the podcast. Either that or she read his letter and felt bad about saying the rumor. I don't know. I wish I knew what it was. I hope we find out either through the podcast or online, but I think she could have said what it was without actually making it seem as bad.
I might be wrong though. I definitely believe when this thing started that she intended to play the rumor, based on the teaser clips that never aired that we got back in episode 1, unless they'll be on the finale (which I doubt).
EDIT: I'm starting to think he was involved too. At least that he was a part of it. I don't think he's as innocent as I did early on.