According to Infohawk's (aka, the dictionary), the Holocaust wasn't a genocide. It doesn't fit his description.
I've been thinking about it, and I think I may know what his definition is even though he won't just say it.
Infohawk believes in racial purity. Not the exact one as Hitler did, but another form. He repeatedly believes that the white race is under attack, Europe is the sacred homeland of the white race, etc.
I think that he believes that if one race kills its own then that's a genocide because it attacks the concept of racial purity.
Thus, the Holocaust was a genocide for Infohawk since white people were killing white people. The Rwanda genocide was a genocide if you confine it only to the actions of Rwandans.
But when it comes to mixed-race genocide, such as the largely white British vs. the brown Bengalis, then it's not a genocide as one race can kill off another. Native Americans killed off is not a genocide because it was different races.
I think that is his main distinction.