That is just straight up not true: https://www.techeblog.com/europe-balcony-solar-system/

Germany's been a pioneer in incentivizing personal solar installations.

In what way exactly anything I said was not true?

It was too little and too late and Germany only got serious about it when there were no longer any other options.

> personal solar installations

It was entirely insignificant back then and growth pretty much entirely stopped between 2012 and 2018.