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If if a sponsored NetID gets reactivated (yearly, say), this is in and of itself insufficient for library resources. A NetIT NetID is required so the Library's system can know who you are, but sponsored NetIDs need to be authorized by the library for content.
Thus, the PI's group must coordinate their sponsored researchersresearcher's library needs with the Library access folks. PI's and/or end users should contact libpublicservices@cornell.edu with an explanation of the need and a length of time the need exists.
Hopefully the Library is able to bulk-provide access if the PI provides them a list of all the sponsored netids NetIDs related to the group.