To me this indicates that, all else aside and even granting for the sake of argument they’re correct in all other aspects, they simply aren’t a good teacher, not providing a basic and easy to share resource. Even during my time in University a couple decades ago I never encountered a professor who had slide available in an easily shareable format yet would refuse to make them available. They’re your own notes on digesting, synthesizing, and analyzing the material? Well that’s exactly the sort of thing that is both useful and essentially your job to impart in a fashion that allows students to learn. Whatever the deficiencies of students today, you’re not doing your job if you decide to stand on principle for your own conception of how a student should learn instead of figuring out what will be effective.
This alone makes the author’s other observations suspect, perhaps not it kind but at least degree, since it’s clear that one of their core gripes is that students simply don’t learn the way they want students to learn, and they aren’t willing to meet students where they’re at to do the job they’re paid for. This isn’t “get off my lawn,” this is a landscaper saying “I’m gonna cut your lawn the way i want to cut it.”