I don't really understand the argument your proposing.
Is it impressions in a stylistic sense (flurishes to the language used), which is a what I'm arguing the LLM usage for.
Or is it impression in the subjective sense of what an author would instill through his message. Feelings, imagry, and such.
Or the impression given to the reader? "This person gives me the impression that they know what they talk about", or "don't know what they talk about?"
I don't know which argument your proposing, but I'd like to make an observation of the LLM usage. I don't know what model the perplexity response is based on, but some of them are "eager to please" by default in conversation("you're absolutely right" and all the other memes). If you "preload" it with a contrarian approach (make a brutally honest critique of this comment in reply to this other comment) it will gladly do a 180 https://chatgpt.com/s/t_699f3b13826c8191b701d0cc84923e71