If I had to decide which set of statements is more poisonous (and pointless) I'd run with Kelly Martin's. Invective seems to be her style, and I guess as she's found it hasn't been very productive in achieving her goal (whatever that may be). On the other hand, she has got all kinds of sources! Each post apparently has a whole set of secret sources! (At least three this time, but maybe more?) Anonymous sources, who also post to her blog anonymously... Was this the irony she was referring to?
On the other hand, regarding private lists - have you considered making the community lists publically viewable but only allowing the specific group of people you've identified to post? By community lists I mean lists with contributors who aren't officially connected to or bound by WMF. Internal communications, in keeping with the standard corporate meaning, should include people internal to the actual organizational structure who are bound by confidentiality agreements.
Just in general terms, anything you say to a semi-public audience will eventually leak - better to just address the public audience first, and say only what you wouldn't mind everyone hearing. And when Kelly comments, don't feed.
Nathan