In the close reason mod toolbox almost all custom close reasons are because the question isn't about Vi or Vim. Not sure how much reputation you need to view that, but here's a screenshot:
I propose we add a custom close reason for this, since it's a fairly common close reason.
On the same page it actually lists this twice already, as:
This question does not appear to be about Vi and Vim family of editors, within the scope defined in the help center.
Once added as "Community" and once by me in 2017, but neither shows up 🤔 I think moderators should probably approve one or the other.
It might be a good idea to tweak the link to /help/on-topic rather than /help, which is a bit clearer:
This question does not appear to be about Vi and Vim family of editors, within the scope defined in the help center.