Compared to what Germany sold, it's not that much, and it probably won't affect the market.
Sales from governments affect the market but selling effect is smaller than emotional and psychological effects on market participants that last longer. After immediate effects from considerable sale, market will be panic and need quite a long time to recover and calm down. Effects even start before sales actually happen, it begins with rumors, news around the air and social media.
For most governments, Bitcoin has no particular value
They did see Bitcoin value after many years since 2009 and after Bitcoin has gotten massively impressive adoption and value as well as price growth.
especially considering that they didn't buy it, they confiscated it.
They did confiscated it not because Bitcoin has zero value. They confiscated it because has value and their confiscations have big value actually.