Traveled to Ancient Times and Became a Slave

Are you sure the author is writing about primitive people from the Stone Age? Can one person build a suspended three-story wooden building with a stone ax in three days? There is no need to build a kiln to knead the bowls and pots with mud, and there is also a tall jar. There is no need to seal it, and the hole is not dug. Just use branches and burn it to become pottery? Can the language of modern people be used in the era of oracle bone inscriptions that can only pronounce "ah, ah, ah, ah, ba"? And understand civilized language?