Notice on this page it has a list of publications, with subheading “organisation instructions” which includes the elders books from 1991.
https://wol.jw.org/en/wol/d/r1/lp-e/1200276167#h=956
Why does it include the 1991 elders books, but none of the more recent elders books?
It looks like one possible expanation for breaking the silence here on the 1991 book, is simply the fact that a picture of this book appears in the Proclaimers book, so it’s already “out there”. Even so, it seems a bit arbitrary, what they mention, and what remains secret.
Selective secrecy gets confusing.