Lmao the post doesn't disprove shit:

So the first element of the tweet, that Truman and "his advisors" thought that the war would be over before an invasion was necessary. This is true to an extent - a number of senior American military personnel did indeed think that the bombs were unnecessary, and that Japan would surrender.

Also love this passive aggressive paragraph:

Shaun did not source his tweet, but a commonly cited source is this site, which contains a set of quotes from senior American military and government officials about the atomic bomb. I'm going to take the liberty of using it to provide the sources that Shaun did not