Those moves are all defined by use of the Byukugan. I'm referring to the basic ability to emit chakra from the body.
Airpalm is a simple arm thrust, Using compressed air, Similar to what Gai does with EE, The byakugan is only used to aid focusing a vital spot, Which anyone can do with basic knowledge of the body and organs, Targeting vital points isn't unique to the byakugan/hyuga. Yet it's still a KKG technique.
Rotation doesn't use the byakugan at all, It's simply emitting chakra from the body, Which you say shouldn't be a KKG, Yet rotation is.
Twin lion fist is just emitting chakra from the hands + shape manipulation, One of the only techniques that specifically says this requires the byakugan
64 palm obviously utalizes the byakugan.
Obviously there is something else in the hyuga's blood that allowed them to manipulate chakra the way they do, Thus why GF is a KKG.
Kishi just ignored them throughout the manga and never got around to explaining the hyuga in any detail