Are Audio Commentaries allowed as titles, and if so are there written guidelines?

I recently found some audio commentaries on the site. I sent a request for deletion for one and was told, to my surprise, that they are eligible titles. I asked for a link to guidelines for submission, and was directed here.

Browsing through these forums I see that podcasts were accepted a year ago, but all the posts I've seen since then, as recently as a couple of weeks ago, say that those are the only audio only accepted productions. I'd like a clear answer as to which is the case. If audio commentaries are allowed could you please make this explicit in the imdb submission guidelines like you have with podcasts? Preferably with instructions about title type and how people should be credited

Thanks