The actual URL is
https://www.wikidata.org/wiki/Wikidata:WikiProject_Source_MetaData
The first thing would be to change the name, perhaps. The 2014 idea was
extremely generic, while recent action (completely unrelated from what
the page states) is only about journals, isn't it? Pick a focus and
choose an understandable name.
Most action around books, Wikisources and hence bibliography is around
https://www.wikidata.org/wiki/Wikidata_talk:WikiProject_Books#Wikiproject_B…
.
Nemo