There are many obvious ways in which this may not be true.
Anyone learning the language and some people with learning disabilities, for example, may communicate better via an LLM.
I promise you, after this past year, you don’t know how happy I am to read issues and PRs in broken English.
There is a sliding scale from that, to it being the LLM that communicates, not the person. LLMs can really reshuffle and change priorities and modify emphasis in a text. All the missing pieces will be filled in and rounded out and sandpapered off by the inner-average-corporate-HR-Redditor of the LLM.