The author is teaching a skill an LLM can do well enough to pass his exams. Is learning English composition in the literary sense now worth what it costs to learn it at a university? That's a very real question now.
What do you mean, “worth it”?
What is the alternative, we carry on without people skilled in the English language?
Not sure this is the provocative question you think it is. Were you educated in a university? Do you like being able to write English well? Would you rather that neither be true about you?