Sasuke was never taught gentle fist.
Doesn't change the fact that Open palm =/= Jyuken.
Bolt grew up in a house full of Hyuugas so thats the taijutsu style he would adapt
Doesn't mean anything until he shows he can legit use it.
how come we've never Kaguya use Gentle Fist against Naruto and Sasuke if its so powerful?
Vacuum Attack is a Jyuken variant. In any case, using Kaguya as an argument means nothing when she wasn't using IT, any of her KKG elements like Lava and Wood, and so on. She was nerfed, so no reason to bring her up.
He was aiming for Shika's tenketsu.
Tenketsu are aimed at with the fingers, not the palm. Anyways, this is conjecture.
Now then, you have your one assumption of Bolt using Jyuken even though it's more likely nothing more than an open palm attack he picked up from Hinata and nothing more.
VS
The FACT that Rotation, Air Palm, TLF, and Vacuum Attack are called KKG, not Hiden.
The FACT that Byakugan provides the high level CC needed for things like TLF and Rotation.
The FACT that Himawari used Jyuken innately mere moments after getting Byakugan.
The FACT that TLF is said to NEED Byakugan to use, and TLF itself is a Jyuken tech.