"I was clueless at first, I was letting him to silly little pointless 2 min feeds and he was always starving and annoyed and I wasn't producing nice big satisfying feeds till I learnt how to draw the feeds out so that they were nice and long and filling..."
In terms of breastfeeding and breastmilk production the above is nonsense. It is not how lactation works from a biological perspective. Spacing feeds causes the body to prodcue less milk. When milk is left 'stored' in the breast a protein called Feedback Inhibitor of Lactation (FIL) accumulates, and this causes milk production to decrease. Frequent drainage of the breasts signals for more milk to be made. Frequent feeds, even if small lead to an abundant milk supply. Infrequent feeds leads to less milk. Also, really full breasts cause a feed to begin with a large volume of lower calorie milk (less fatty, more sugary), whereas frequent small feeds from well-drained breasts (like when a baby cluster feeds) means the baby is getting higher fat more filling and calorific milk. Try looking in a lactation textbook for verification of this 
. I'm not aware that the author in question has any lactation qualifications/training.
Babies also have very small stomachs and are designed to feed little and often. There is no evidence that sleep duration is associated with size of feed or calorie intake that I'm aware of either (except to say that a baby who really isn't getting enough milk for whatever reason may be v unsettled and not sleep well, or conversely may be a very sleepy newborn -a v worrying scenario).
"also I wouldn't have been able to maintain constant cluster feeding as my nipples were cracked and I screamed in pain when I fed.. I needed the gaps between big satisfying feeds to heal... "
This suggests that all was not going well with breastfeeding 
. Advice to just keep going is shocking and would be inappropriate. Did you complain? Someone giving out that sort of advice in your situation sounds like they might need re-training.
In the situation you describe the baby might well not be satisfied, as milk transfer into the baby might also be inefficient and slow -that often accompanies the soreness, and both are symptoms of very common problems that can often be easily rectified with expert support. I am sorry you did not get this .
The difficulty with extrapolating from individual cases is that often it doesn't tell us much. You obviously managed to breastfeed despite following advice to space feeds etc. In your case your supply was not diminished and all worked out well. This would not be the case for many mums and babies . Milk production simply doesn't work the way described, and although some mums and babies obviously can manage feeding this way, lots cannot.