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Different welding chemistry, different welding requirements (filler, temperature, possibly process).

As the GP points out, the chromium when vaporized is a lot worse for you than what's typically in plain steel.

Not just that, but, if you weld it, now you have exposed the plain steel and have invited rust inside the coating.

You wouldn’t be welding the stainless

Have you done much welding? I'd like to know how you imagine this is achieved.

If your welding disturbs the coating and leaves gaps or cracks in the stainless coating, it will allow air and moisture to contact and corrode the carbon steel core. And once the core corrodes, the stainless coating becomes the weight bearing part, and you have a massive problem. Assembling this would presumably require some care and expertise beyond normal rebar.

Ok sure yes that does sound bad, so any welded parts would need to be protected

if you're only welding the stainless coating, i doubt that would be as strong as if you were to weld the inner rebar directly. do you expect them to re-coat with stainless after these welds?

That’s my point, you would not be welding the stainless part