Even having read all this, I still don't get why podfic as only kind of fanwork needs some kind of protection line/template just to prevent that someone may add some info about the fic on the podfic page for which no fic page exists.

That fic can overshadow anything else is a common problem, not a podfic specific one (there are no individual fanart pages at all as far as I can tell nor a category for fanart to find fanart related entries even though there are thousands of fanrt pieces archived in fanlore mostly as eyecandy in fic and zine articles with little said about them, it's all unlabelled and art itself is either on story pages, on zine pages, though admittedly art-centric publications like doujinshi or calendars have their categories, or on artist pages, regardless that frequently art inspires fic or that sometimes art can be hugely popular while the fic is not all that remarkable). IMO the solution should be editing guidelines, and gardener intervention if someone edits in a way that buries the podfic aspect, not warning boxes everywhere.

I mean, I totally sympathize with the point that it is important not to reinforce the impression that it is all about fic, and to create visibility for podfic, but I don't think an extra podfic header is the way to go.