Actually, yes it is absolutely true. I've had three breastfed babies. I know all about breastmilk and digestion.

By 4 months of age, a baby should be able to go at LEAST 4 hours in between feedings and many/most will go longer at night, so at the most MAYBE you'd have to get up for one feeding in the middle of the night. I know I was lucky, but all three of mine were sleeping through the night between 6-8 weeks.
I always gave mine a good feeding between 11-12 and at that age they were sleeping til at least 5 am. They were breastfed exclusively. I know not all babies are the same, but by 4 months old, they don't need to eat every 2-3 hours like when they are newborns.
I also let my baby cry it out (within reason) if I knew they had been well fed, diaper changed, etc. They learned to soothe themselves.
Many people let their baby snack and the baby never gets a good solid feeding so the kid is just crying for the breast all day and all night long.