The article seems to imply this is what is happening, as writing style converges towards LLM's style. You can call it what you want, but the important bit is that this is how it appears that LLM's are being used.
Checking against an LLM then using your own voice feels completely fine
Why use an LLM? If you're worried about style, starting with your own voice is more efficient. If you're worried about facts, looking something up in a primary source is best, and is probably cheaper on a few axes, especially if you need to check/validate anyway...
The "you need to write in a more professional business oriented way" is something that a lot of people are having difficulty with. Yes, this needs to be addressed earlier in someone's education more forcefully - but the SMSification of long form text started a while ago.
With that said, the "Ok, you need to write long form with correct grammar when sending an email that a director or VP is CC'ed on". It used to be Grammarly as the "install this and have it fix up your grammar and tone" ( https://web.archive.org/web/20191104093353/https://www.gramm... GPT-1 timeframe there). However, LLMs of today seem to be more accessible than Grammarly but it largely does the same thing - fix up and refine tone.
What I don't see from back then is people decrying Grammarly saying that it's making everything sound the same.
I'm also not sure if I would prefer the pre-fixup emails to what is produced by an LLM unless sending coworkers to remedial writing classes is something that is acceptable.
:|
When I do have expertise, I use them because I am able to check.