I'm seeing some different numbers as well, some say it's even over 40% now (article below), which would correlate well with the statement in the OP's article claiming 33% solar/wind use (presumably the rest is mainly hydroelectric and some geothermal).
I wonder if some are counting only electricity use versus overall energy use (e.g. including heating, vehicles, etc.). In your wiki link though, it does state the percentage is 39% as of 2019 if I'm reading it correctly.
Renewable energy's share of Germany's overall power supply mix rose by 5.4 percentage points last year to 46%, data from Europe's biggest state-funded research and development service showed.
mobile.reuters.com
Anyhow, I won't dismiss any point of view at this point, but I'd like to see a more data-driven analysis than opinion pieces, and that goes for both sides.