If there's one vote to delete, you shouldn't worry about it too much; it takes 10 votes to delete a question which such a high score. Delete votes never expire, but the chances that it will accumulate so many votes are low.
I'd say that the question is rightfully closed (it's a textbook list question); similar old questions around the network have got a ...
This may be a bug caused by the recent migration to CommonMark, and indeed it seems to be related to the large amount of HTML (I've encountered similar issues while trying to fix broken images across the network).
I've fixed it by adding an extra newline between
and the images. They show up now.