Yea but you have a point in that GB didn't say it was CoC yet he did with Shanks. Countless times we have seen fodder recognize CoC clashes when it is being used but GB didn't even point out basic CoC infused strike? Not sure I buy that tbh
Agree it's just a visual haki effect in general
The only absolute sure ways we know ACoC is being used:
1. Blatant curved Haki lightning trails
2. Haki lightning + ACoA emission (Oda likes to emphasize ACoC with ACoA)
3. Fodders are knocked out in the vicinity of the attack
4. Someone says CoC is being infused
Btw here is my thread and theory on ACoC
https://worstgen.alwaysdata.net/forum/threads/why-acoc-is-not-being-spammed-anymore.65050/