The code is "obviously" borked.... and has a completely illogical test condition: If the word is longer than its position in the sentence, then it is the longest word.
Having said that, as you point out, it's apparent that it passes the online test cases.
However, the comments immediately pointed out the basic problem, and subsequently the comment discussions listed additional (though not as severe) problems.
With those comments in place, it makes sense for the question to be closed as not-working. The user has the option of fixing those basic issues and asking for a review again. Essentially, now the user knows their code does not work. Recent examples of this happening are comments such as:
So, I am happy for the question to be closed as off-topic since, now, the user knows it's broken, and that knowledge came through a comment. The close-votes are logical.
What's odd is that the user then elected to delete their whole account (and the question was deleted with their account).
Given that, it makes no sense, in this instance, to do anything other than leave the question the way it is, closed, and deleted.
In general, if a question is posted with issues that are obvious to our community (even if not obvious to the asker), comments, and close-votes are an indication that the asker should review those basic issues and edit their question. Obviously, if there's answers already, then their question should be unchanged and a follow-up review considered instead.