They’re quoting Reuters, with the disclaimer “according to”. And assuming that’s true, it’s for only a single day. It’s not going to replace coal, the new “green” fuel for Germany.
I guess you are also part of the “it’s impossible” group.
I don’t believe that solar is going to be THE solution in cloudy Germany. I do beleive that a low-carbon economy is possible though. CCS will have to play a role. The biggest progress on that is being made in the US at the moment.
For the record, there are dozens of reports on the 50% mark. It wasn’t “just” Reuters. Feel free to type it into google. If you type in “Deutchland 50% Solarstrom” you will get even more, but you may need to use google translate