Nobody is saying that they are Earth humans. Nobody. We are saying that the fantasy humans are physically capable of what Earth humans are and do not possess any inherent to the race supernatural abilities like Earth humans do not. It doesn't go beyond what is inherent to humans on Earth.
In the fantasy setting the fantasy humans can learn to use external magic which is nothing inherent to the human race. Any race can learn to be a wizard. In the fantasy setting fantasy humans can have their blood altered or mixed with other things to allow sorcery, which also is not inherent to being human. Any race can be a sorcerer.