What he means is that you need to support the latest Bukkit RB to get out of submissions, which I guess is not possible atm because there is no RB that supports 1.9 yet, you will just have to wait
Bukkit dosnt support the pre-release build yet for good reasons its a PRE-release, so therefore it is not the official game and not ready. (Bugs) Its not recommended
Why are people submitting plugins that don't even work yet? Isn't this exactly why we have a WIP section?