“A different type of screaming and yelling I’ve never heard… It was breaking my heart to see him that way” says mom. Yes, that’s the sound of a child losing his sense of trust and safety around his mother.
This is how timeouts work, even when they’re following all the recommended steps.
Then they spin it, with cute music and all, and say “He got the message! It worked!” What message?
That they’re bigger, stronger, and can outlast him. That his desire for play and attention and a pen cap is not valued by his parents. That to disobey authority will result in physical aggression. In that way it’s no different from hitting/spanking.