The online Yolngu Matha dictionary describes bunanatjini (N123) as a clan-nation and a language. Schebeck (2001:88) and Wilkinson (1991:13) describe Bunanatjini as a Ritharrrngu N104 speaking group. In his grammar of Ritharrngu N104, Heath says that Bunana?ini (N123) mat?a consists of Buwarpuwar N217 and Mini?giri N218 sub-groups (1980:2). The historical spelling 'Buranadjini' (N123) occurs in Capell (1963), followed by Oates who lists Buranadjina/Buranadjini (N123) under Ridarngu N104 (1975:317, 385). For Yolngu languages see Yolngu Matha N230.
Speaker numbers were measured differently across the censuses and various other sources listed in AUSTLANG. You are encouraged to refer to the sources.
Speaker numbers for ‘NILS 2004’ and ‘2005 estimate’ come from 'Table F.3: Numbers of speakers of Australian Indigenous languages (various surveys)' in 'Appendix F NILS endangerment and absolute number results' in McConvell, Marmion and McNicol 2005, pages 198-230 (PDF, 2.5MB).