Forgive a sharp example, but consider someone who is disabled and cannot write or speak well. If they send a loving letter to a family member using an LLM to help form words and sentences they otherwise could not, do you really think the recipient feels cheated by the LLM? Would you seriously accuse them of not having written that letter?

Your arguments are verging on the obtuse.

Read the article again. Rob Pike got a letter from a machine saying it is "deeply grateful". There's no human there expressing anything, worse, it's a machine gaslighting the recipient.

If a family member used LLM to write a letter to another, then at least the recipient can believe the sender feels the gratefulness in his/her human soul. If they used LLM to write a message in their own language, they would've proofread it to see if they agree with the sentiment, and "take ownership" of the message. If they used LLM to write a message in a foreign language, there's a sender there with a feeling, and a trust of the technology to translate the message to a language they don't know in the hopes that the technology does it correctly.

If it turns out the sender just told a machine to send their friends each a copy-pasted message, the sender is a lazy shallow asshole, but there's still in their heart an attempt of brightening someone's day, however lazily executed...

If you buy a hallmark greetings card and send that to someone with your signature on it, did you write the whole card?