It is clearly wrong as pointed out in a comment, which makes it beyond saving, and the single Looks OK closed the review.
Deleting low-quality beyond-saving regardless of an attempt at an answer, is a legit reason for deletion per the help center. Otherwise the noise-level will increase.
When should I vote to delete an answer?
You may vote to delete answers in the following cases:
- The answer is extremely low quality: There is little to no scope for improvement
I can understand not deleting so-so answers, especially on programming sites (to have a visible record of what not to do), but not this.