OP, you’re off your rocker!
are there some suggestions here I might not personally choose (eg Rice Krispies & juice)? Yes.
However, it’s not terrible nutritional advice, and as part of a balanced diet throughout a day, it’s fine, and manageable for many parents, who for various reasons, may struggle around suitable nutrition.
No advice should be looked at in isolation.
And no diet is perfect - I’m fairly big on home-cooked meals, very little processed or prepared food (for example, we never get takeaways, I really hate them, but I accept that’s my own oddity, and that it’s quite normal for people to have them occasionally) but we like our sweet food, I bake, I buy chocolate bars, kids have daily treats.
My kids are now 18, 16 & 14 so diet is different but even when they were small, they got regular treats.