User blog comment:Kirkburn/Technical Update: March 25, 2015/@comment-26009167-20150326010528/@comment-126761-20150326015318

The banner notification that appears after deleting a page got a little confused - it couldn't properly choose between notifying about the article deletion or the accompanying comment deletions. We've stopped it from incorrectly choosing the latter. (The issue started with last week's release.)

If comments aren't deleted when an article is, please do report it to us. It's a separate issue, though.