WTF? The Soviets peddled propaganda BS (that the Nazis had committed the Katyn Massacre before the Soviets moved in) for decades. Fessing up to the truth after your lies have lost all credibility doesn't count (if it did, Clinton would be considered an honest man, a la Dan Rather).
No, just pay attention to what I've said. True, Soviets denied it and blamed it on the Nazis, I've never stated differently. But it was Gorbachev that admitted it was Soviet doing, and he actually went to Katyn and made a public apology there. I do not know about his motives at the time, but in today's Russia (and I've said Russia) everybody knows the truth, and no one denies responsibility on this one, apart from some raving radicals.