The argument seems very poorly reasoned to me.
> First, he conflates the ability to generate human-like text with the ability to communicate.
This is incorrect. In fact, lukev does the opposite. That is one of the fundamental parts of his argument -- that those two things are different.
> Second, LukeV claims that GPT-3 is at its weakest when writing about the relationships between a set of concepts. However, this is not necessarily true. GPT-3 may not be able to generate text that is perfectly grammatical or that makes perfect sense, but it is often able to generate text that is nonetheless meaningful and insightful. For example, GPT-3 has been used to generate essays on complex topics such as the philosophy of mind, and these essays have been well-received by readers.
I believe this is the best paragraph of the argument, but it is also the most difficult to rebut because it is rather subjective. Whether a text is meaningful or insightful is up the individual reading it. I would be surprised, however, if experts on the philosophy of mind found the essays mentioned by GPT-3 to be meaningful or insightful -- as opposed to regurgitations of concepts that are in the texts that have been fed to GPT-3's model.
> Third, LukeV argues that the world does not need more words, but this is clearly not the case. The world needs more communication...
The presence of more words in the world does not necessarily entail more communication. The two concepts are fairly closely related but are definitely not synonymous.
This doesn't necessarily mean that I agree with lukev, of course. I do think that GPT-3 as it currently exists should not be used to generate text that is meant for human consumption without being edited first. I can certainly see how it would be useful as a tool for generating an outline of an essay, especially with well-crafted prompts.
I am of course open to more arguments and data on the subject =)