Those five realms are in “rupa loka.” I just revised #8 to say that specifically:
“8. Anāgāmis who have “burned” kāma rāga saṁyojana and thus permanently severed their connection to kāma loka will be reborn in five realms in rupa loka RESERVED for them: Aviha, Atappa, Sudassa, Sudassi, and Akanittakha. These realms are called “Suddhāvāsa” or “pure abodes.” See a description in the “Saṅgīti Sutta (DN 33)” starting with “Pañca suddhāvāsā—avihā, atappā, sudassā, sudassī, akaniṭṭhā.”
