It's crazy the types of things public libraries have to deal with and come up with solutions for.
I read up on it. They aren't really social workers. They are folks trained as social workers or experienced social workers acting in the capacity of librarians - connecting people in need of social services with the means to utilize them. Librarians would consider them adult services associates or librarians.
Librarians typically feel extremely uncomfortable actually performing social services that aren't informational, and having those services performed in their libraries. A social worker would typically expect to maintain a name-lined record to services provided, otherwise there would be little benefit in those services. The idea that a librarian would use a recorded service history to guide future services is pretty much an anathema to the ethics of librarianship.
My wife became a librarian as a grant-funded Jobs Information Resource Librarian. They tried to replace the public grant with The Robin Hood foundation. But they wanted to track individual progress as they used these services, and BPL said no way. This is what I have in mind.
For a librarian, if a patron comes in for, schedules, etc. services to fix up their resume and get interview practice it doesn't matter a tiny bit whether that person really wants a job, is trying to get a job, actually gets a job, or just enjoys the company. So long as the patron participates in an appropriate way, they help all the same.