I wouldn't call it exactly debunking, it's more like what one expects when one hears the word "language" is a completely separate language, and most idioglossias on record are more like patois or a creole (look it up).
There is an article on wikipedia about idioglossia which mentions both June and Jennifer Gibbons and the Kennedy twins, Grace and Genny ("Poto and Cabengo"). June and Jennifer spoke English, when they spoke at all. Grace and Genny spoke a combination of English, German, and their own invented words. Their father in an interview said he remembered them holding up objects and giving them specific names. The grammar was interesting, including a complex method of distinguishing singular from plural.
There are very few academic studies of idioglossias at all. Linguists don't usually get to study them. Those who speak them usually fall into the hands of educational psychologists, whose objective is to get the speakers to discard their own language in favor of English. I mean, obviously, but why discard? Why not both? From what I get from Marjorie Wallace's story of the Kennedys, reports on idioglossia she read seemed to view idioglossia-speakers as though they were miniature con artists attempting to put one over on the scientists.
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