As he's still prisoner to the Dark Angels at the end of the audio, it's just a matter of whether he is handed over the Raven Guard and Curze before they go back to Caliban - if they do, then yes. If they don't then it's like they take him to Terra.
Still, it remains to be seen whether he goes RG and takes the spoiled Raptors with him on a penitent crusade, or joins the Grey Knights - as Khiron/Chiroptera are similar enough that I don't think it was unintentional by ADB to leave that spoiler in, especially with him being both the authors of The Emperor's Gift, and all of the relevant Night Lords parts. We shall see.
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