Yes, we should add a warning to the game-identification tag. It is one of the most commonly seen questions that fail to meet the requirements defined in the tag.
Piggy-backing off the original post's answer for this tag:
"The warning should replicate the tag info, which provides enough information, but typically is not read by new users"
Suggested warning text (open to suggestions):
Only ask if you have a screenshot, video, or audio clip from the game you want to identify. The only game identification questions allowed on this site are those asking to identify games in movies, pictures, videos, advertisements or otherwise where an unknown game appears - not from a description of what you can recall from memory, or from a picture you drew yourself.