If this is your takeaway you don't understand Ritzenhein's training.
Hunter is training like a high school or college athlete - moderate volume, too much intensity. That's a great way to stay tired and injured.
I think it's clear by now that while Hunter was one of the best ever American 18-year-olds, he will probably not be even one of the best American 28-year-olds in 2025-26. That said, he can run a lot better than he is now.