Because it's the preview of a content update to LOTRO: Shadows of Angmar, you dumbass. You could've found that out by, you know, just following the link to check for yourself. Sheesh. What a concept, huh? And not sure what you mean by "original LOTRO". The LOTRO that is covered in the article and that was released last year was at some point called Middle Earth Online but ever since the name change to LOTRO it has always carried the "Shadows of Angmar" subtitle.
Got that? Good. Here's two dollars. Now please piss off and buy yourself a BIG bag of clues. kthxplzdielol!!!!111