I don't think he is judging the way in which you learn. He's simply referring to the current state of research like: Putnam, et al. (2016). Optimizing Learning in College: Tips From Cognitive Psychology

There has been lots written on learning strategies but one thing we are rather certain of is that cramming is usually the worst way to retain information (if you want to learn it well). You can even read about funky neuronal reasonings for that argument if you are interested.

Expanding your thought a bit: for example, for people with ADHD-PI, cramming may in fact be the only way in which they can learn the stuff they're not currently being obsessive about.

That said, you can't optimize for everyone simultaneously. There's plenty of cramming-friendly resources available.