This of course is nonsense. Herbert W. Armstrong said that Christ would return within twenty years in his book Mystery of the Ages. (PCG has since deleted those words so someone in there knows HWA spoke nonsense.) How convenient for them to forget this.
Also Herbert W. Armstrong never said the Soviet Union would collapse. He thought it would survive intact until a few years after Christ's return. It shows how biased some many in the COGs are that they never seem to notice this. This inconvenient truth is just tossed into the memory hole.
It is true that HWA said that some Eastern European states would break away from Moscow's orbit and join the European Empire he said would arise at any moment. But he never talked of the Soviet Union collapsing. He did not teach that. Also he portrayed the rise of the European Empire to be far quicker then what has actually happened. In Mystery of the Ages Christ was supposed to return by 2005 at the most.
So assertions that the fall of the Berlin Wall somehow prove that HWA was right is just complete nonsense spread by people who, for whatever reason, are still in denial that HWA was a false prophet who merely talked out of his own "human reasoning".