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I believe with some electrode materials it is possible to make chlorine gas, I'm not sure if steel and iron are some of them.

But either way, as I understand if, you do it slowly you're _mainly_ going to make bleach instead, with small amounts of chlorine gas.

Probably not the best idea to breathe it anyway, but shouldn't take much ventilation to make it perfectly safe.

"Some of you might have concerns that chlorine gas will develop, but because chlorine is so reactive, and because the salt solution is dilute, it’s safe for this setup."

Not sure if that was added later.

Yes, as the text in the part I quoted says "dilute" now as well. Which is good as there are many "bucket chemists" out there, people who think, why add a pinch as more will be better and quicker mindsets kick in.

You are oxidizing the iron instead of the chloride ion. The great reactivity of chlorine gas indicates that it requires much energy to prepare.