they are just saying the name does not seem to come from any Aboriginal language.

quote from my original post (Wikipedia on Didgeridoo) ... the first appearance of the word didgeridoo in Australian dictionaries occurred in 1919 in the Australian National Dictionary ... The word is not in any Aboriginal dialect and linguists have long suspected the word is imitative of the sound made by a didgeridoo. But Ms Lonergan said an experiment she conducted asking subjects to make the sound of the instrument yielded words full of vowels starting with the letter "b" or "m". No subjects made the sound didgeridoo.

another extract form Wikipedia on Didgeridoo - Yi?aki (sometimes spelt yirdaki) is one of the most commonly used names, although – strictly speaking – it refers to a specific type of instrument made and used by the Yolngu people of north-east Arnhem Land.

What is the real name for the didgeridoo? There are many different Aboriginal names for the instrument, primarily because there are so many different language groups amongst the Aboriginal people.
In T.B. Wilson's Narrative of a Voyage Round the World (1835), there is a drawing of an Aboriginal man from Raffles Bay, Coburg Peninsula, playing the instrument. Observations made at Raffles Bay, describe the instrument as being about 3 feet long and made of bamboo. Names obtained were eboro, ebero and ebroo.
According to Prof Trevor Jones, (Monash University) there are at least 45 different synonyms for the didgeridoo. Some are bambu, bombo, kambu, pampuu, (may reflect didgeridoo origins from bamboo), garnbak, illpirra, martba, Jiragi, Yiraki, Yidaki, (seem close dialectically and which means "bamoo" although no longer commonly made from bamboo). (read on for 2 tables of names in various Northern Territory languages)

Where did didgeridoo come from? The Didgeridoo is a wooden BRASS instrument thought to have originated in Arnhem Land, Northern Territory, Australia. 2. Researchers have suggested it may be the world's oldest musical instrument, over 40,000 years old (read on for 13 facts about the didgeridoo)

About the only thing I knew was the instrument was played in northern Australia & that it's local name began with "Y" - now I see that name was only one of it's local names.

sandra