Seems legit enough. The exploit claims to be for an older version of iOS, this is coming from an infamous iOS hacker, both iOS and the Switch use WebKit. The guy says he removed iOS-specific stuff, the RPC on his Mac looks good. I've also heard some stuff about the exploit itself, rumor is that it's an infamous bug named after a mythical bird...
Good bloody luck getting a release though. Anyone who knows the hell the Wii U went through will back me up here - brace yourselves.