Indeed, but I'm horrified that ANYone, especially a professional company, would suggest anything for such a setup other than a properly wired plug - including the earth (ground) wire. The narrator even warns that a fault could short to the aluminium*
* (strontium, dysprosium, uranium, ..., aluminIUM [element 13] ;] )

*O¤ýývÉ(±*°MA2n‰SCohYÅB›Xt‚ÂÊ ..., [copper ýire];}

I guess it is a good thing that they suggested a method of properly wiring the plug then, huh?

Hmmm, that's interesting: I copy and pasted your string of symbols, but it didn't come out the same! I'll try it again...
*O¤ýývÉ(±*°MA2n‰SCohYÅB›Xt‚ÂÊ ..., [copper ýire];}
Well it is the same when I paste it, so perhaps it's the saving that changes it. Here goes...

Hi 8bit. I'm not sure what "*O¤ýývÉ(±*°MA2n‰SCohYÅB›Xt‚ÂÊ ..., [copper ýire];}" means but I imagine you were frustrated at my original comment. A misunderstanding I think: in my experience sticking a stripped earth wire in the earth recepticle of an extension cord - where the third pin of a "properly wired" male plug would go - is not "properly wired" (about 3:30 in the video). Of course it may be a type of extension cord plug I've not seen before, and maybe it is perfectly safe by the standards of the country in which the video was shot. In that case I withdraw my objection.
And yes, the slide together plug was indeed a nifty idea.