Nice vid’
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We had these when I was in high school, they have been around for a long time. The bit moves freely within its holder that attaches to any drill chuck. It works because the teeth bite in randomly and cause it to go off center and form a square.
They are really cool but are only really useful if you need a square without radii which you could do with an EDM or a broach.
http://mathworld.wolfram.com/ReuleauxTriangle.html
more info and theory here: http://mikesenese.com/DOIT/2011/10/drilling-square-holes-with-a-reuleaux-triangle/