Actually no.
Not all gentle fist attacks target the tenketsus/chakra points and not all require the byakugan.
Body blow
Airpalm
Rotation
Now based on your post, Since these don't need the byakugan as they don't target chakra points, These shouldn't be KKG but they are, Which is something no one as answered yet besides the "i don't trust the DB" argument.
Attacks that utilize a Dojutsu would be hidden Techniques (depending on their origin) as they don't require said dojutsu to actually learn it/use it, They just need it to increase the efficiency of said technique.
Sure, there are moves that don't directly attack the points and that don't require the use of Byakugan. Body Blow and Airpalm release a burst of chakra which overwhelms the opponents body with chakra released, destroying the organs/points within said persons body. Sure Rotation doesn't do that, but it's a defensive move which wasn't designed for offensive purposes. The art of this fighting style is to not physically bruise your enemy, it's to attack their fragile interior of their bodies.
The reason being it's not a hidden tech is because they're used in conjunction to Gentle Fist making them that, which is only taught by the Hyuga's teachings. Not any random shinobi would be able to pick it up, despite having a proficiency of releasing chakra from their body.
Not sure if I worded it well enough, but I hope you got my point