I'm sorry, but this is simply nonsense.
The military clique in charge of Japan had no intention of surrendering, and was fully prepared to have an Okinawa-type resistance across all of Japan. Their hope was that the horrendous US casualties would force the US to allow the clique to remain in control of Japan. Barring that, the entire Japanese population was expected to die in a glorious if futile defense of the Emperor.
The atomic bombings made it clear that the US possessed both the means and the will to annihilate Japan with no opportunity of resistance: i.e., no glory.
With no possibility of an "honorable" resistance, surrender became-- for the first time-- an option.
And even then, we made a huge breach of our unconditional surrender goals by promising to allow Hirohito to remain as Emperor.
Hiroshima and Nagasaki were both left untouched by earlier bombing raids precisely to impress the Japanese with the destructive power of atomic weapons.
Eugene Sledge (author of the Pacific War memoir, "With the Old Breed: At Peleliu and Okinawa") was slated to be in the first or second wave of the first planned assault on the main islands. There were to be five waves: the planners expected the first three to be utterly annihilated. Millions of Japanese civilians would have died as well.
Keeping the Emperor if possible was a spiritual imperative for the Japanese situation. He was worshiped as a god. It’s good that America understood it, because it was, so to speak, the jiu jitsu pressure point to make all Japan yield.
Exactly.