What you were looking for is either no longer linked by us or is no longer relevant so is no longer on the site. This is not an error (or 404) page; we know it's gone, but it's just that completely removing the link was deemed the wrong thing to do for some reason. Thus the link remains but it goes nowhere. Why would we do this? The most common reason would be that we wanted to make it clear that the content was removed, rather than have you think that we just forgot the link.
Will this content come back? Possibly in some cases; if you're curious feel free to ask in the forum!