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Whether it's a regular dragon or Kaido, dragons should have a very high level of base durability. Nola the snake from Skypeia was so tough that neither Zoro nor Luffy could break through her skin. A dragon which is a mythical beast, one with special significance in Asian mythology no less, should be far more durable than Nola. So your example isn't really the best in this case. Nonetheless I think Kaido's durability is something else, he shrugged off a 10km fall while Big Mom was shitting herself falling from the Chateau. Which makes it all the more impressive that Zoro is going to cut him and surpass Oden.
I can't see the kanji very well since it's blurred but from what I could read, there's no mention of eastern dragons, just the difference between kanji at Oda uses to describe different kinds of dragons. For example, the 'dragon' kanji in Celestial Dragon is different from the one used to describe Kaido, and meanwhile Monkey D Dragon's name is in katakana.
I can't see the kanji very well since it's blurred but from what I could read, there's no mention of eastern dragons, just the difference between kanji at Oda uses to describe different kinds of dragons. For example, the 'dragon' kanji in Celestial Dragon is different from the one used to describe Kaido, and meanwhile Monkey D Dragon's name is in katakana.