No touching is advanced form of haki which would be advanced form of ryou so cap
All IMPACT moves in onepiece causes internal damaged
Don't get the garp example. You showed garp using a basic punch and not galaxy impact which was again an impact move from a distance via no touching?
The truth is we know shit about what Haki each character is using unless Oda spoon feeds us. He made Haki so inconsistent that anyone who claims that X used Y is bullshit.
Regular haki can accomplish what Coby did, whether it's Advanced or not, neither me or you knows but Oda, just like many people speculate Garp and Aokiji using ACoC when that explosion panel came because it's similiar to Shanks haki explosion.
Yet Oda didn't bothered telling if it was or not, therefore it was inconclusive. It's all speculation.
Thick lines this, trail that, doesn't work when Oda barely makes an effort to differentiate the Haki types.