The best answer on my recent question was deleted by its owner. It raises many of the issues that were the reason I asked the question and doesn't appear to have any major issues to be a cause for deletion. I tried asking about it in chat but didn't get a solution. The user isn't active there and I can't ping them there.
I tried flagging the post with a custom flag asking a mod what to do. They declined the flag and said:
You could @ them in a comment.
However since the answer is deleted, I can't @ them there. Is it really appropriate to find another one of their posts to tag them for something unrelated?
Basically, I don't know what the correct way to handle this situation is. I would like to be able to upvote or discuss the answer with the user but can do neither while it is deleted.
Carcer has pointed out an error with their answer in the comments of this post. This could possibly be the reason for deletion. However I think this meta question still stands. What is the correct approach in this situation?