Out of curiosity, what makes it the first modern genocide? At what point do the other genocides leading up to the holocaust not count as modern?
In terms of genocide, it was the first one to use computers. It used systematic, organizational principles similar to what a business might use. It created a set of processes both to carry it out and to make the population accept and even participate in the unspeakable.
A bit of research reveals I was wrong in my assumptions, though, and the Armenian genocide certainly counts by that metric.