I'm not sure who you're quoting when you say, "Russian tanks had a significant advantage over US tanks," but I don't have any reason to think your quote is true. In case you intend that as a paraphrase of what I was saying, let me correct that misreading. I was making no claims about the relative quality of the tanks; by all reports, Soviet tanks were vastly inferior to German tanks as well.

Rather, my primary tank-related claim was that the USSR was producing enormous quantities of war materiel, as exemplified by tanks; in 01943 they outproduced Germany almost 2:1 in quantity of tanks, and even in 01944 when Germany was catching up, they still outproduced them. The quality of that materiel was merely adequate, but it still would have represented a very significant military threat to the US's position in Europe, as it had to Germany's.

My second claim was that the USSR was in a better logistical situation with respect to Europe than the US was. I don't think that's controversial, since Moscow is in Europe, and so was most Soviet farmland and much Soviet arms production.