FIrst, I think professional researchers have dispensed with your claim that Catherine Lejeune is Miq'Maq .
Catherine Lejeune was born in France around 1633. For almost a century, researchers speculated that Lejeune had been Mi’kmaq. This theory, based on a French historian’s faulty argument in the 1880s, led to a number of fanciful stories about her origins among genealogists. The most common, which continues to circulate widely today, claims that Lejeune is the granddaughter of Mi’kmaw Grand Chief Henri Membertou. There’s no evidence to support this claim.
Over the past 20 years, a number of historians of early Acadia have provided compelling documentary evidence that she was born in France. Plus, the results of genetic ancestry testing of nearly a dozen of her present-day descendants have consistently pointed to her French origins. There’s no longer a debate about Lejeune’s origins among historians.
https://nsadvocate.org/2019/09/23/how-some-north-americans-claim-a-...
As for Francois Savoie, the only evidence we have is speculation - The source for his origin being Mataize, France is here:
However Massignon[3] speculates that he may have come from Martaizé, near Loudun, France because the name Savoie is among the many Acadian names that are found in the nearby Seigneury d'Aulnay (comprising of the villages of Angliers, Aulnay, Martaizé and La Chausée).[4] However, Francois' birth record has not been found.
The citation is: Massignon, Geneviève. "Les parlers français d'Acadie, enquête linguistique", Librairie Klincksieck, Paris, 1962, 2 tomes. p32 (first French families in Acadia; p36. Savoie is found in the Seigneury of d'Aulnay in France; p49 Savoie family
Simply put, Menou who was the Governeur d'Acadie and who brought many settlers from France, was Seigneur d'Aulnay, and many of the original Acadians came from that region of France. And given many Savoie's can be found in that region, its logical to presume Francois Savoie also came from that region.
The Bill Gabunia Debuque evidence presented, on the surface, is underwhelming. First, he claims he is only 3% European. However, his ancestry on this website shows it is largely European, if not 100%. So that in itself is confusing.
One would have to prove that his matches to Acadian descendants of Francois Savoie are unique and at the exclusion of any other descendant of any of the various Quebec/Acadian royal gateways of which there are several: See https://www.francogene.com/gfna/gfna/998/qrd30.htm
Given the Acadian diaspora to Quebec, Louisiana, and the entire east coast of the US, we have Lavoie DNA in many lines in those regions. Even if one accepts his personal documented lineage to the Savoie's of Italy, and matches to some Acadian/Quebec descendants, that does not prove the link is through Francois Savoie.
Beyond that, I'm not seeing anything to support your "overwhelming" "strong" evidence. Oral tradition is notoriously bad evidence. You reference a "deathbed confession". If it was documented contemporaneously, that would be compelling. Even if it was documented 2 or 3 generations later it would be worthy of further investigation. However, its been nearly 400 years. A 400 year old oral tradition of a deathbed confession is hardly compelling.
Lacking further evidence, I think your theory is speculation at best. And Acadian genealogists like Stephen White, Lucie Leblanc Constantino, and Denis Beauregard who I linked to above, are not willing to step up to your theory. In fact, they would say its highly unlikely given the stronger evidence that Francois Savoie was a simple plowman, probably from Martaize France since that is where most of his contemporary Acadians came from.