Language relations and Brutaka's Mutation

So I’ve heard conflicting reports about the Fortress of the Mad Great Being- some stating that it insulated Brutaka, Helryx, Vezon, etc, from the effects of the Ignika when Mata Nui used it to reverse the effects of Mutagen- some stating that it did not. Were Brutaka’s mutations effected? Furthermore, I’ve heard claims that Mata Nui used the Ignika to enable the Matoran Universe Inhabitants to speak Agori. How were those in the fortress effected?