The author quite literally says that the last few years were a "detour" that has wasted a trillion dollars. He explicitly lists building new LLMs, building larger LLMs and scaling LLMs as the problem and source of the waste. So I don't think I am strawmanning his position at all.
It is one thing to say that OpenAI has overpromised on revenues in the short term and another to say that the entire experiment was a waste of time because it hasn't led to AGI, which is quite literally the stance that Marcus has taken in this article.