The article somehow implies that the feed-in tariff is Germany was 0.57 EUR until 2011 when it was cut 29%. In fact, there is a formula for automatic tariff cuts built into the law that introduced them: if i recall it correctly, tariff goes 8% down each year at least, but more if there is over 3.5 GW installed. That way, they descended to the levels that are currently much below retail electricity prices there, 0.17-0.24 EUR depending on the size of installation, with electricity being 0.24-0.29 depending on the region. And yet it is highly profitable to install solar systems there.
Retail grid parity in Germany has been achieved.