Anyone know anything about this?

if this is correct how do we access either or both?

Wikidata is the structured knowledge graph that feeds Wikipedia, powers the knowledge panels you see on Google search results, and gets referenced by large language models when they need verified information about a book or its author. Open Library is the Internet Archive's bibliographic database, which has been a core source for AI training data since the earliest days of large language models. Between them, they form the foundation of what AI systems treat as verified book data.