Nexus changed their policy on file deletions. Basically, you can't. The file is "archived" instead. This was done so that the files would always be available for their "Collections" system. Problem was, mod authors discovered this AFTER THE FACT, and some of 'em were pretty tweaked. So, Nexus allowed folks given a 30 day window to remove ALL of their files... Not just one or two, it was all or nothing. Of course, that annoyed mod authors even more, and a fair few of 'em did exactly that. Removed ALL of their content from Nexus. Some of that content is just gone. Others moved their files to some other hosting site. Still others set up their own sites, or moved to Discord. There are still a LOT of mods on Nexus, but, a selection of authors won't upload there any more. The days of a single, central, repository of mods, is now gone.