Whether his point is valid or not does not change the fact that I do not want to hear from him. A broken clock is right twice a day and a screaming edge lord teenager will occasionally say something insightful, it doesn't mean I should seek either of them out as a source of information when there are better options, even if in those rare moments they are true. The best rubric for advice is take it only from those who have the life you want; this man does not have the life I want for myself, and I can deduce that from his lack of emotional development.

As for the advice. I do think it's perhaps fair to say that reading good material is foundational to being able to think well enough to write good material, however that only takes you so far; to write is the only way to get better at writing. So the advise exists in a tension with that reality; I don't think it's accurate to say that reading is the MOST important, that's like saying that eating is the most important aspect of becoming a chef. Perhaps it is foundational but it will not take you all the way, there is something essential to chefness that lies beyond eating.