The site is registered to someone named Lina Duarte. On B&N she's listed as an editor of several of their books:
http://www.barnesandnoble.com/c/lina-duarte
While they're up front that they don't pay advances, there is no info on the royalty structure. And as you say, nothing about who they are or their experience in publishing.
Oh, and this page has a form and an email link:
http://langleyslovelies.com/write-for-us/
And finally, have you read any of the books? Reading a couple of books (or at least a preview if one is available) ought to give you a good idea of the level of editing.
You might use their submission form or email link to get more information.