This answer appeared in the Low Quality Posts review queue because of it's "length and content", according to the description of the queue. Since the answer was quite long, I assume that length wasn't the factor. I understand that the heuristic may not be public, but can anyone shed some light on this?
Was this a consequence of the migration, the rapid accumulation of downvotes, or some key phrase in the answer? I presume it wasn't a review audit.