To tell you the truth, it wasn't with Hyogoro that Luffy learned something new, it was with KAIDO, Hyogoro taught his limit, Hyogoro doesn't have COC, so he taught penetration from outside to inside, disregarding COC, in this chapter , Luffy realizes that KAIDO hits him without even touching him, causing a lot of damage, and what Luffy does is attack KAIDO without touching him and defend himself without touching the enemy, something he never did, as well as kaido and his divine diagram did, by default, luffy doesn't necessarily need to use his arms to defend himself or stop a blow now, he can just use the COC to stop the attack, even without touching it, and apply Ryou + Coc, to do more damage , next chapter, luckily we will have an explanation of kaido.
Ryou has always shown to be a skill that needed to be within a few centimeters (it does not necessarily need to touch the user), to inflict internal damage, but RYOU was never seen being used defensively and stopping attacks without touching, this applies only offensively and within limit, COC generates a wave, as if Luffy is holding something etc ...