This is just misinformation. Of course, in most places, Germany has speed limits. For example, the speed limit within cities is generally 50km/h, around schools

This is just misinformation. Of course, in most places, Germany has speed limits. For example, the speed limit within cities is generally 50km/h, around schools and in residentials areas it's 30km/h and outside of towns, it's usually somewhere between 60 and 100km/h. The only exception to this are highways where, in fact, 70% of the time, there is no general speed limit. Even so, specific sections will always have speed limits (e.g. around a construction site), and additionally, there are strict rules for how to behave on the highway (in particular, it's absolutely 100% forbidden to pass a car on the right and you generally have to drive as far to the right as possible unless you want to pass a slower vehicle).