This came from the author's blog too. I would like to typeset this, but don't have the skills or time. But I can translate this through-and-through if someone wants to, just dm me.
The main gist of it is that "race" is being discussed, primarily how things are categorized in the world of Dungeon Meshi. Here are the main points being said:
-In the East, dwarfs and gnomes are uncommon, so Easterners typically think they are the smaller race in comparison to the Ogres.
-Also, the East categorizes humans as "humans" and anything else as non-human. However, this is different in the land where the story is set, as will be noted below.
-In what I will call "the West," "Humans" are not just limited to human beings, but includes Elves, Dwarves, and all the human-like races. What are distinctly not human among the fantasy races are Kobolds and Orcs. This distinction is made based on bone structure.
-Because elves, dwarves and halflings all have about the same number of bones in their bodies as humans, along with a very similar skeletal structure, they are all classified as "human." However, Kobolds and Orcs distinctly have non-human features that causes them to have a different bone count: the snout and tail for the kobolds, and the feet for the Orcs.
-How about the Ogre (Oni)? Kabru states that they would be "humans" as the horns on their head may be "extra" but are nothing more than deformities/extensions of the skull.