The purpose of the speech was to convince the people, both civilian and military, that the Germans were less prepared than they themselves said and that hunger and desolation were already installed in Berlin.
The image that Stalin tries to show his people is that of a difficult situation, but that has already reached its maximum of difficulty, that Germany can no longer bear the expense and wear of the war, and that the Teutonic armies will soon fall by difficulties coming from Germany.
And in what Stalin was completely right.
