Yes, I have worked in OSHA regulated industries and currently work in the wine industry as winemaker and winery owner.
Wonderful that you are an expert and a professional. Good to know.
The SO2 compressed gas cylinders are what you need to watch out for, not acidified sulfites.
That time I had to take a break once when simply added KMeta to a 300 L vat of must, coughing and hacking by getting too much SO2 upon addition, basically says my personal experience is different.
Oh, I know what I did "wrong", after the fact (in short, I got careless -- a common cause of accidents, at the home and in industry). A learning experience. But that is kind of the point.... A lot can go wrong that one may not expect. Especially if all the right conditions are met. Which may align more often with home DIY projects trying new things, and possibly being not fully informed of possible issues at forum discussions. Even by experts who may see many precautions as so "routine" that it does not merit mention, or think at an industrial scale, not at a bench level scale. And that a DIY may not even think about as being need to be done, and which can actually end up causing themselves damage if not done. Been there myself. Sometimes I was too much an expert in my field, that I missed informing a layman of what to me was an "obvious" point. I had to learn, there are no "obvious" points.
This explains Cox's further advice to ventilate the room.
Oh, yes. I forgot to mention... the above SO2 issue to me happened outside. So Jeff Cox also missed a different obvious** that caused me to fail in my case.
In short... Bad things can happen anywhere. And in unexpected ways. The best defense if a good offense, and a good offense is to try to avoid when things may go wrong if possible, but if not possible to be fully informed of what may happen so one can take rapid and corrective measures. And since you work in Industry, I trust I am preaching to the Choir here.
** I took a lot of chemistry in college. I know what I did wrong. And called myself an idiot right afterword, because I knew better. Kind of like...
Again, I just got careless. But it was a mistake anyone could make, especially one who was not aware of what could happen.
Note Jeff Cox's comment about using the sulfite-only solution on stainless below.
I don't have SS. And I find this rather simple to make mix ratio is rather mild in its SO2 release compared to more acid solutions that are more likely to be not prepared correctly and may release more SO2.