@Raven well the translator did point out that these are CGI goblins...so I'm inclined to think that the person creating this was too lazy to draw the monster specifically so they just use CGI to create the monsters while drawing the humans among other things such as the scenery but I guess they didn't know how to draw imaginary creatures so they just left it to the computer AI to do it? Hopefully that helps answer your question.
*sips tea while watching* Im just here to watch the Chaos unfold - my pfp sauce is Luno from the game Wuthering waves