There's an element of this about him streaming. I remember another streamer talking about how he has to turn his mind off to interact with chat and not get caught up in the information they try to drown him in. This is a bad look for him, but his actual ability would be better than what's being displayed. He may very well be hovering around an average American level (5th grade). If he can normally cope with modifiers like the word ultra or search his mind for words like authority, then he'd sit right there at the top of the bell curve being able to pronounce words but receive no information from them