We've been over this Nik-chin. We got the explanation that causing damage to Domi Reversi beings that would be lethal causes them to revert back without any damage, even if they are shopped to pieces.
You are officially disproven here. Burden of proof that DR beings are beyond regeneration with strong enough Haki applied is on you.
I mean blame Oda for having Kinemon tank Kaido's spiked club with ACoC to the head. Given the sheer size of Kaido's club, everyone who got hit into the head should've had a hole in the head but apparently didn't. Yet Kaido's cutting breath cut off Kiku's arm beyond repair.
The only things so far that left scars are blade cuts or elemental attacks like Akainu's magma and Kuzan's ice (on Akainu), due to their lethality. I may have missed some other instances where scars were left though, like with explosions or bullets. But punches? Never happened. While cuts leaving scars is ordinary even when no Haki is involved.