The way I have read it is the post was listing all of the dropped routes from MAN in 2015, regardless of whether other carriers were going to step in on/continue said routes. So the post is correct in stating that MAN will lose its daily Delta ATL flight. Of course the Virgin flight that is replacing it has separately been counted as a new route, so overall there is no significant loss or gain (aside from a difference the number of seats) for the route.