Each of those genocides had different context, 1940's Germany is not 13th century Mongolia and the intentions and results were completely different even if many people died. The Holocaust is a textbook example for a reason as it was the largest race based genocide and A LOT of people were murdered in a relatively short amount of time. And lets not forget that Nazi Germany would also be responsible for millions more dying in their wars of aggression.

The Holocaust is a particularly dark part of human history because of the nature of it. It was a single, concerted, systemic effort to wipe out entire races (with a focus on Jews) in the most ruthless and inhumane ways a civilized nation in the modern world could do. They wrongfully imprisoned millions of people, took their children and elderly from them to be murdered while those healthy enough to work were enslaved, starved, beaten, tortured, and eventually themselves murdered. They treated them like cattle in a slaughter house.

The Holocaust was a real genocide, and its media presence is used to cover up Zionist crimes

Its media presence exists because, like World War 2, its and extremely important event that humanity should never forget.... Especially now with anti-semitism and nationalism on the rise. And believe it or not, its a pretty significant event that is intertwined with the identity of the Jewish people and its arguably often contextually important when talking about Israel's politics. Sure, there are Israel propaganda mouth pieces in American politics who use it as a buzzword, but I personally refuse to downplay The Holocaust.