In the Meta Stack Exchange FAQ of review tests (audits), it is mentioned:
Also, if you find something in the review audit system that makes audits extremely obvious (as in one can tell that a review is an audit in just a few seconds, with little to no extra investigation), feel free to report that flaw.
So, the goal of this post is to report such a flaw.
In the above screenshot we can notice that the question has 0 answers. So it's pretty obvious to the reviewer that this review is an audit.
If the answer we are looking at is deleted, but the question is shown in its current state, it will cause the answer count not to be the number of other answers +1, as it always should be.
This flaw is immediately obvious if one is looking for it, so it seems highly exploitable.