Do you have a source for this? I can't find anything on the interwebs.
Discussion
I think the quote that the fond is basically empty as per Oct 31 was published by the Münchner Merkur. I'm trying to find it again.
However, they're planning to stabilise this (aka recover pensions) with the pension package III, You'll find more info on that below or by doing some topic related searching.
https://www.telepolis.de/features/Wohlstandsverluste-mit-Rentenreform-II-10000590.html
But the real question is where did the money go every working citizen has paid into the pension fond since WWII?