You don’t advance technology as a monolith. Germany is a leader in material science and mechanical engineering.
Germany is sub-par in software engineering and in its physical communication infrastructure. This is in part due to persistent cultural wariness of surveillance technologies like social media. People aren’t keen to fund the infrastructure to make mass surveillance easier, and politicians don’t want to be seen as pushing for the capability.
Germany also has the capability to advance nuclear technology, but doesn’t due to mass scientific illiteracy among the voting population that falsely believes nuclear energy to be more dangerous than fossil fuels due to decades of propaganda by idiots.
So no. Germany is not the most technologically advanced country. It could be pretty close, but there are major elements of society who dedicate themselves to making sure that Germany uses inferior technology that kills more people, damages the environment more, costs more money, and will cause the total collapse of Earth’s biosphere due to a runaway greenhouse effect. Mostly in the Green Party. Because radiation from nuclear accidents is apparently scarier than way more people dying of regular pollution constantly and the total annihilation of all life on Earth as the oceans boil away.