There's not anything obviously wrong with using WordPress for publishing documents like this - they are meant to be public after all.

The problem was essentially that, through a misconfiguration, they published it early.

In huge org's, doing computer-related stuff the "right" way often involves so many meetings, sign-offs, and miles of red tape that your grandchildren would die of old age before anything actually got done.

Vs. if you just let Will and Pete do it in WordPress (or on Facebook, or such) then needed tasks might actually be accomplished.