So uhh... We're supposed to host the files on publicly accessible file sharing sites - But they aren't allowed to be public? Following that logic, the second rule can never be possible since there is no such thing as a publicly available, exclusive access site.
You can search any file hosting website - even the ones that use "private links". Even Dropbox can be publicly crawled.
People that are trying to construe the rules as invalid do like to bring this up.
However I think it is pretty clear, and people without an agenda, have no problem understand it.
You can host your files on a publicly accessible site without the general public having access unless they know where to look. As long as you only tell them where to look here or on Steam Hub you are all good. Now what is confusing about that. Obviously you are not responsible if some random person happens to randomly find the files on that site. Now if you go on other sites and give direct links to your files then you are breaking our rules and cannot advertise your mod on this site, Seams reasonable to me, I am sorry you do not find it so.