What did you mean to point to? This URL doesn't exist it seems
Yes. This USED to be where LI had a page describing advanced search operators. This, among other former LI help pages, no longer exists.
They have rolled out a new set of 'learning' pages, most filled with videos, targeted to different potential user segments, and killed the old content.
The advanced operators still work, but there doesn't appear to be any public documentation for them anymore.