Actually, the quote was about America. While the Soviets had lopsided tank kill ratios against the Germans, it was due to the quality of their organization and tactics, not their tanks. Their tanks were in many ways superior to the German tanks. In fact, the Panther and Tiger tanks of Germany were developed in response to Soviet T-34s and KVs (the Panther being in many ways a copy of the T-34).
American tanks were designed to be superior to the German tanks that began the war, but by the time they actually saw combat Germany was fielding tanks that were far superior in terms of armor and armament. This was a surprise to the tankers, but not to the production planners, who were well aware that the Germans were fielding heavier tanks, but they made a conscious decision to go with quantity over quality, as switching to heavier tank production would have led to manufacturing delays as factories were re-tooled. That in turn could have delayed the invasion of Europe, something that the US wanted to achieve at the earliest possible date.