I have to agree with this. Completely relying on LLM for all your learning needs is a disaster. But being absolutely against use of LLMs isn't doing you any favors. This is where you don't have a formula but rely on you judgement and evidence of your having learnt something.

For example having an LLM summarize a dense topic and to find books so that you can filter faster and spend time reading those books works way better than having the LLM summarize the books or the topic (or even relying on second hand information). Another one is having the LLM quiz you on your topics of interest. With questions tailored to attack specific areas that you struggle with. Its wonderful at this, nothing I've used comes close to what an LLM can do here.

You define for yourself what your goals are, slowly refining them as you learn more, and use LLM as a tool. This ,I find works best for learning.

Make it your goal to teach a room full of other humans that topic. I guarantee you will know that material cold. I've done lots of technical training in my career and after teaching a class two or three times I find myself to be very competent in the topic.

It's long been the case that the best way to learn something is to teach something.