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I'd rather not comment about the reliability of ATK because that would be missing the point, but their recipe seems overly fussy and anyway they cut their onions too long in that video. I think it's kind of gross when you have dangling onion strands.

Slow cook them first for a few hours at a low temperature and then caramelize after. All your onion in a dry pot. Don't add water. Strain them when done and you have... soggy pale onions. Heat up the biggest pan you have and add some butter to do the caramelization (don't crowd the pan like they do in their video). Add some good balsamic vinegar and brown sugar while you're at it. Be sure to make a huge batch so you can freeze some for later. Don't bag and freeze before letting the onions come to room temperature. It's a lot of water in them onions man, but you can use that strained out water for a vegetable stock!