By August 1945 the conventional bombing campaign of the USAAF was shifting targets towards Japan's rail and road infrastructure to cripple Japanese food production and supply. Japan itself barely avoided mass starvation in real life thanks to emergency shipments of food. Continuing the bombing through August and September would have resulted in mass famine.
Your own source points out: "This strangulation would have more effectively and efficiently destroyed the economic structure of the country than individually destroying Japan's cities and factories . It would have reduced Japan to a series of isolated communities, incapable of any sustained industrial production, incapable of moving food from the agricultural areas to the cities, and incapable of rapid large-scale movements of troops and munitions."
Over in a matter of weeks. The war was over
The Japanese had, in fact, already sued for peace. The atomic bomb played no decisive part, from a purely military point of view, in the defeat of Japan.
— Fleet Admiral Chester W. Nimitz, Commander in Chief of the U.S. Pacific Fleet, [89]
The use of [the atomic bombs] at Hiroshima and Nagasaki was of no material assistance in our war against Japan. The Japanese were already defeated and ready to surrender because of the effective sea blockade and the successful bombing with conventional weapons ... The lethal possibilities of atomic warfare in the future are frightening. My own feeling was that in being the first to use it, we had adopted an ethical standard common to the barbarians of the Dark Ages. I was not taught to make war in that fashion, and wars cannot be won by destroying women and children.
— Fleet Admiral William D. Leahy, Chief of Staff to President Truman, 1950, [99]
The atomic bomb had nothing to do with the end of the war at all.
— Major General Curtis LeMay, XXI Bomber Command, September 1945, [100]
The first atomic bomb was an unnecessary experiment ... It was a mistake to ever drop it ... [the scientists] had this toy and they wanted to try it out, so they dropped it.
— Fleet Admiral William Halsey Jr., 1946, [100]