It's precedent-ish. The first court in Munich did the hard work from scratch. The Aachen court copied and pasted their logic into their own ruling. There is a strong chance that for the time being other courts will come up with similar rulings under comparable case conditions. But Google may be waiting for a case where they are not quite as likely to lose if they appeal. Funny shit can still happen, especially if the highest federal court can be convinced to rule on a case like this. So it's too early to tell if this precedent has more long lasting staying power.

but I assume that it sets legal precedent for all.

Other courts might look at it for inspiration, but since Germany has a civil law system (as opposed to the common law system that is usual in English-speaking countries), prior rulings do not really have as much significance as “legal precedent” here.