To (partially) answer my own question in case someone else is considering this, I read a few comments on that video that seem to indicate this works great on rusted metal but should not be used with chromed surfaces:
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"Don't do it - chrome is plated onto steel. This will plate iron onto the chrome. This isn't "rust removal" as much as re-plating iron onto iron or steel."
"This works nicely but please do not try to use partitial rust removal for chromed or otherwise layered parts. The process will also remove partitally other layers from metals. I tryed to remove tiny rusted dots from chrome plated motorcyle part and killed the chrome surface."
"No lead, chrome, stainless--if you stick to iron, cast iron, and steel your waste water remains far less toxic, containing ferrous compounds and whatever came off the piece being cleaned. Yes, it will remove everything, rust, paint, oil, BUT it will not fill in any pitting from rust. Yes hardening will occur, but after removal the piece will become stable again given time. Use a plastic a plastic container unless you want to clean the inside of a metal item."
