This is one of those "non-explanations" you often get from modern neuroscience (in this case from the cult of "predictive coding"). There is absolutely no explanatory power here with regard to the nature of emotions. It just assumes its conclusion. The brain should just make its prediction and the behavior should happen in experiential void. Why is there any feeling associated with this prediction? There's no explanation for it that doesn't engage in obvious handwaving. And even if you accept one of the handwavy answers, it still doesn't even remotely approach the questions that people actually care about, like: why would the prediction give this specific quality of feeling, rather than some other?