The problem with those cables is that on one end you have a digital signal and it somehow magically converts to analog by the time it reaches the other end. Like the person you quoted said in order to achieve such a conversion you would need an external box that is powered to convert an incoming digital signal to analog. If this sounds familiar it should. The switch from analog to digital signal for tv broadcast required a converter box to do a similar conversion, and similarily no cable on it's own could achieve the result. Because it's impossible.
So all those cables, none of them actually work?