http://www.wpfdc.com/eng/news.php?tab_id=1&id=498
He died in 1857 according to:
http://www.newadvent.org/cathen/11480c.htm
http://www.catholicity.com/encyclopedia/p/paris.html
The Crimean War was from 1854 to 1856.
A google search reveals many sources attribute those comments to him.
There were two Bishops named Sibour in Paris at nearly the same time:
Bishop Léon-François Sibour †, Auxiliary Bishop Emeritus of Paris, France
Archbishop Marie-Dominique-Auguste Sibour †, Archbishop of Paris, France
I guess I was reading about the wrong one. Thanks for the links. Interesting stuff but awfully depressing. More scars from the schism.