When an answer is deleted from Low Quality Review by under-20K users, this is recorded as "Post Deleted from Review" in the revision history.
However, there is no record of this event in the Data Explorer. For example, this post was deleted from review, then undeleted and brought into shape (so far so good). But
- there is no deletion event in PostHistory table
- there is no deletion vote "by reviewers" in Votes table
I don't know if entering a pseudo-vote in the Votes table is really needed, but having a record of the deletion in Post History would make perfect sense. As is, it shows undeletion without prior deletion.