Headline is misleading.

The article only mentions "a genuine stuxnet copy" (the Stuxnet "application") whereas the headline title mentions "source code to Stuxnet" which implies the C or assembler or code was used to create Stuxnet in the first place (which be an incredible find indeed).

The article seems rather ridiculous in any case. I recall an analysis of Stuxnet describing it as a conventional virus and it became visible specifically because like other viruses, it spread through a variety of systems.