I would consider this a derivative, or secondary source. It is what we usually like to refer to as "another tree". There is a lot of data on the site, but there are no citations to original sources, as far as I can tell. For WikiTree and the Nordic Project purposes, a link to that page would not be sufficient to consider a profile "sourced", if that is all that is on the profile.
If the link is working, however, then it could be left on the profile, as it can act as an aid in finding original sources for future researchers. I would personally put links to such sites under a See Also: section at the bottom of the sources list.