The article suggests they are on the verge of exhausting the labor supply because they can't get anyone to stay for more than a couple years though, because so many people have already been there and left -- and that this has in the past been intentional on the employer's part, to only keep workers for a couple years.

If true, that puts a different light on things -- how the combination of having such a large labor force and a strategy to intentionally have high turnover combine to exhaust the labor supply, sure.