Feeding to schedule can mess up breastfeeding, so that's the most concerning bit of 'wisdom'. It's just a very old fashioned approach from a time when breastfeeding was out of fashion. As it happens my ds had a four hourly feeding pattern from birth, oh and he liked being swaddled too, but dd hated it and fed pretty randomly.
Breastfed babies don't usually need winding, and insisting that every feed needs a nappy change is just a bit weird - why would you want an alert baby in the middle of the night? If they aren't hungry what do you do then?
Presumably 'snack feeding' refers to cluster feeding which is essential in breastfeeding to build supply, plus the implication is that you would have to ignore your babies hunger in order to keep to the required spacing.
Better to read the current NHS feeding guidelines (referenced in smaller print) than take the opinion of one individual as some sort of sure fire way - in fact the 'only way you ever get a good night's sleep again'.
Plus the pictures are a bit problematic too.