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...

I think maybe you missed that my response was to this comment:

> How can you be grateful enough to want to send someone such a letter but not grateful enough to write one?

I already said in other comments that the OP was a different situation.