It's outright dumb to compare this to a town-level attack based on AoE. The scary part about this attack is its AP. Even regular CoC-based punches with small barriers from Luffy were making Kaido recall the spanking he took from his mom. Look at the size of Garp's barrier; that shits all over anything we've seen as far as the CoC mastery goes. This attack probably scales above or on par with Luffy's OKG in AP.