David Noonan comments:
That’s the curse of being a game designer—you see so many versions of things that sometimes you can’t remember which things actually see print, in which books, and under which names. If a game designer answers a rules question of the top of his or her head, be a little suspicious. Those heads are crammed with previous versions, playtest versions, and Versions That Should Not Be.
This makes sense to me. At work, once a project is inexorably out of my hands, I sometimes flush it from my mind so that I do not worry about what changes six people down the line are going to make; if I am asked for input later, I can recycle those synapses. Other times, I am the mental archivist who explains that we did that project two years ago under another name, or we changed it half-way through and they are thinking of the old version, or we have yet update the documentation to reflect reality, or…
When you hear a dev make an off-hand comment, he may be thinking of any version of the game starting in pre-beta up through things on internal test, planned for the future, or designed and then scrapped. They may have a different internal name for whatever it is or use some hodgepodge of technical meanings. Really, they are trying to give you the right answer, but you may want to double-check in a more structured environment.