Why dont people talk about the genocide of Prussians?

When you think of genocide you probably think of the one the Nazis have committed. But the one the Prussians suffered from is somehow much less notable. There were approximately 1 million Prussians in 13th century, while in the 17th there were less than 100000. A very smart Redditor from r/AskTeenGirls has calculated that since their population was decreasing by 10% each century, while the world population was increasing, that means they were 70% less than the average, for two centuries. With the average 20th century population increase being 350% it means that in the 17th century, the Prussians were 4.2 times more likely to die than to give birth to a child. This has been acknowledged by multiple historians, that is “a genocide” to say the least.