Update: we've added a new post history entry for such questions, which should make this less confusing for future review-deletions:
The post history tells the story: it was deleted after the review was completed... And then the author undeleted it.
This is possible on any post where less than threshold users actually cast delete votes (where threshold is 3 for answers) - in other words, every post deleted because the Low Quality review completed, rather than every post that was deleted by 20K+ users or moderators thus completing the review.
See, the checks that normally prevent authors from undeleting community-deleted posts depend on a check that runs against the users recorded in the post history entry for the deletion...
...and there's no post history entry created for Low Quality Review-deleted posts.
There are currently 124 posts on Stack Overflow that were deleted in response to LQ reviews, and then later undeleted by their authors. Note that 76 of these were edited by their authors - and 22 of those were later up-voted or accepted (by someone other than the author)!