This is also a bit misleading though right? Northwestern was obliged to put 11 other hospitals and something on the order of like 150 to 200 clinic/other locations on its books largely for the purposes of access. So that rural communities across northern Illinois can also have the same access as people in Chicago.
The fact is, they are a rural healthcare system. Because the options that were in those locations previously were unable to make a long term go of it.
AFAIK, the other hospitals/clinics under the Northwestern umbrella don't really factor into whether the downtown Northwestern Memorial campus qualifies for 340B (insofar as they all have their own CCNs and qualify independently). In this case, Northwestern Memorial qualifies because it a) got reclassified as rural b) became an RRC (likely based on its staff specialty mix) c) meets the RRC DSH threshold of >= 8%.
Northwestern Memorial does treat a lot of rural patients, so maybe it does deserve 340B. That said, it seems clear that it's not they type of struggling safety-net/rural hospital 340B was originally intended to subsidize.
The money is shared at the system level. The referrals are to/from other hospitals/clinics in the system. Many of the other facilities in the system, exist because of Northwestern Memorial. This is what needs to be done to ensure access.