It's at least the second time someone has confused the site for computer games related and I wonder if the name, "Role-playing Games" is not a confusing one. Why not add "Tabletop" to the site title, or something like this, which would make the difference more clear on the first sight?
It wouldn't help.
People who are that confused don't bother to read our fAQ or anything else before diving right in. Giving additional cues to them is like tossing bread pellets into a black hole. We close their questions (not downvote) and move on.
This clue already exists. Open an incognito window and you'll see:
If they don't get a clue after seeing this than the best we can do is educate them post facto.