Oda drew Garp entering Hachinosu with Galaxy Impact (an acoc attack) with its distinctive gigantic barrier + thick lightning lines upon impact. I wonder why he used the exact same effect for this chapter lol
One way or another, either Garp used a variation of galaxy impact and Kuzan matched it with CoA + ice glove or Kuzan had acoc and we never saw the panel when he coated it. Remember, Kuzan’s fist also doesn’t have armament when ice glove was shown. There’s a missing panel of him of at least coating his hand with hardening.
Also, you don’t need the no-touch effect to show acoc. Yamato, Zoro, and Oden just infuse their attacks with acoc, they touch their opponents.