Von Brandenstein lists Windaga as one of his six 'Dundas District dialects' but puts a question mark after this name. He says it is a tribal name and that he is not sure if it 'belongs to Njagi-Njagi' A1 (which is outside of his 'Dundas district').
There is no language data; consequently, Windaga is not included as a language heading in the Thesaurus.
... from Norseman to Peak Charles (von Brandenstein 1980:2)
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).