Never saw it prior, and I’ve drafted my fair share of articles - both business & personal - in numerous versions of Word, utilizing all manner of colorful metaphors.
Even dumbass. This is new, I believe to O365. What I can’t say for certain is the last version I used prior, perhaps Office 2010. Somewhere in between, it seems...
Depends on what professional options you turn on. Grammar and style vs grammar and whatever they coded in this week. But it’s been there for a while. I definitely remember “more business” suggestions in Word 95.