The messages in the ACARS section (they will also show in the system information tab) are merely to indicate ATN capability (if VER and ADM are filled in correctly in the system information section it will show ATN capable if the hardware is too, otherwise ATN NOT CAPABLE). The messages for the VHF section indicate the actual connection status to an ATN, obviously ATN requires a mode 2 data connection and that the data network advertises an available ATN service. This is at the moment only the case in certain European FIRs, such as EDUU, LHCC, LOVV etc. Trying to establish a CPDLC connection in these will fail unless the aircraft is ATN capable. Maastricht (EDYY) offers both, CPDLC via FANS (so via any available data connection, be it SATCOM or plain old ACARS over VHF) as well as ATN via Mode 2.