Just guessing, but the LSU site might well be using published numbers. In that limited sense, they are correct as far as the author knows. As a test, we might check Confederate casualty figures by state as published by Clement Evans, Confederate Military History, vol. XII. My parents found a set for $40 when I was in high school, and I've always keep it close at hand.

With regard to the list of Alabama officers who lost their lives during the war, perhaps Jim Martin, Ken Jones or someone else would be willing to do this. I'm sure it could be fashioned into an interesting and attractive web page. It would also serve a useful purpose for reference and updates (additions and corrections).