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I agree that either the author made a typo repeatedly through the entire document, or they were confused about the meaning of the word. I was just curious if perhaps the author wasn't a native English speaker and this usage came from another language.
I'm curious. In what language is, "grog", a drinking vessle?
I don't know that you can't make a good solder joint with this, but the ones in the video were definitely cold solder joints. I agree that this looks extremely unsafe as well. If you don't like battery operated soldering irons, try a butane one. Something like this one: https://www.amazon.com/Weller-P2C-Butane-Soldering-Iron/dp/B000B61L0G
It's not a stereogram. The image you are seeing from each eye is the same. It's just a reflection. Since the reflective surface is at 45 degrees to the phone screen, the reflection appears at 90 degrees (upright).