Cleon
Legend
I still don't even see the flavor. However, I'd be amenable to an underbar stating that there are ancestral goatlings with lots of character levels who are immune to aging (funny, I don't see it in the type rules, but I thought Outsiders often are anyway). I'm not sure why they'd necessarily be immune to disease, though. I also don't see the need for a full statblock.
I was thinking of adding immunity to disease just to distinguish them more from "mortal" goatlings. It'll also help explain how they survive so long.
Moving on:
Regular goatfolk have Str 11, Dex 15, Con 13, Int 10, Wis 8, Cha 8. The Goatmen of Kavaja document suggests "Goatlings have a -1 penalty to Charisma and Wisdom. However, a +1 bonus may be applied to Strength and Intelligence, or a single +2 bonus to one of these two abilities at the player's option." So that looks ok, although the low Cha will hurt the SLAs for the "goat magic." I'd probably raise Cha to at least 10 maybe at the cost of a little Dex. What do you think?
As written, it suggest a racial bonus to Intelligence and Strength and a racial penalty to Charisma and Wisdom. Maybe +2 to one and -2 to t'other. We could leave it at that and not give them the Goatfolk's bonuses to Dex and Con.
As for the low Charisma penalizing the "Goat-Magic", who's to say it isn't Int-based?