Hosting of PDFs was disabled on the Wiki some time ago. This is why the topos for specific crags are hosted within the Vimeo group.
Why its redirecting you I've no idea, but the most likely explanation is that "someone" (quite possibly a bot) changed the links on the Wiki to point there since the Wiki is indicating that they are links to external sites rather than files hosted by the Wiki itself.
I've heard there is a print guide out for that area now though.