Yeah that was presumably not ACoC, but rather lightning sparkles used to highlight simply a powerful blow or more likely an advanced color of basic CoA like the one displayed the first time in the clash between Katakuri and Luffy with Katakuri highlighting how he possessed an advanced color of CoA and that was the first time we would witness lightning sparkles during a clash IIRC.
So lightning sparkles should be arguably constituting that typology of haki, or ACoC, but I doubt that ACoC can work off contact.
So lightning sparkles should be arguably constituting that typology of haki, or ACoC, but I doubt that ACoC can work off contact.