They did say "post on" the excerpts instead of "post" the excerpts. That's a syntactic nicety which must have gone unnoticed by Arrington, but which was presumably clear in the mind of the Fortune rep.
Until (my emphasis), means that they couldn't post simultaneously, nor before. I deduced then they were required to post after.
There most have been a counter statement elsewhere given your upvotes, sorry I missed it, what was it?