Even then, if he was holding back, it was a draw match. So we can't say to what degree. I wouldn't say Ryu has the durability of "an island" because each object has a different type of durability, a large mass of land and a human body are two different things. He has vast superhuman durability, which turns out better in many situations.
My whole point is he takes hits from somebody who did the aforementioned feats, and it isn't the first time he's taken hits from city destroyers (Bison isn't one to go easy on a character), and of the such.
So to say he took hits from them is not a lie, and since he is more powerful than those characters now, he can definitely absorb their damage, especially since he brought his power up to that point now.