Land Rover issued a similar recall on their '16 diesel engines. In the letter sent out to owners it explicitly stated that DEF consumption could double. I think this is indirectly related to the recall on our Cruzes. I think these companies are quietly tightening up the emissions on these diesel cars. Not that anybody was cheating per-se, but that maybe they had a bit more emissions than they should have. Just a theory on my part.
As for the matter at hand - I got the "recall to the recall" done yesterday. CEL is gone and car is back to normal (so far).