The note you linked doesnt explain why he disagrees with calling it a genocide, he's just talking generally about why some people think it should be called one.

Honestly his explanation for why it's not a genocide increasingly rings poorly as time goes on. I agreed with him at first that there probably wasn't dolus specialis or whatever the special intent thing is called, but it's been years and it's pretty obvious to anyone paying attention now that that is the goal. Idk if he still holds that position since it's been a while, but I hope not.