You have misinterpreted the sentence. There is no need for these "Librarians" to be qualified which is why the posts have been deemed to merit B2 in the "current cost saving climate".
The two current staff were ATO then SATO then pursued an upgrade to MTO2 then this translated to B5 in their eyes. They have been very lucky to get B5 without being "skilled" but still they moan.
Topper