Currently this is
Game-identification questions are okay only if you include screenshots, audio, or other tangible media from the game.
Since it is deemed worthy that artefacts that deviate from these regulations in a specific way are fine too, I suggest we turn it into something like
Game-identification questions are okay if you include screenshots, audio, or other tangible media from the game itself or from credible references.
Only ask if you have a screenshot, video, or audio clip from the game you want to identify, or from a credible reference. This tag is only for identifying games in movies, pictures, videos, advertisements, references, or otherwise, where an unknown or unidentified game appears - not from a description of what you can recall from memory, from a picture you drew yourself, or from an otherwise dubious artefact.
The emphasis lying on the fact that the reference must be credible, i.e. there must not be any basis for it being liable to referencing a game that does not actually exist (as a game).
Questions like this, this, and this reference apparent games that might not exist, but that is still not enough ground to conclude they are not real games (although two of them quite decisively turned out to be).
This question, asking to identify a game based on an audio recording, got closed as a duplicate of a question that has since disappeared. I think this would fall under a credible source, since the user has no reason to deceive us, and genuinely thought he heard someone playing a game.
I'm not sure if it is necessary, since questions like this don't fall under the game-identification umbrella, but we might include reference-identification questions somehow as part of an Easter egg/in-game cultural reference clause to the game-identification tag.