You misunderstand. A librarian may not know if something is true or not, but they are educated on how to research something to find out if something is true or not. As you said, their job is to manage sources, which includes knowing with sources are reliable and which sources to look at for certain types of information.
Ask a librarian or fact checking site? I don’t consider either of them to be “experts” on misinformation, especially supposed “fact checking sites”.
And a librarian’s mandate is about managing sources, not being an expert in the data itself.
Otherwise good stuff.
You misunderstand. A librarian may not know if something is true or not, but they are educated on how to research something to find out if something is true or not. As you said, their job is to manage sources, which includes knowing with sources are reliable and which sources to look at for certain types of information.