This is not Hex-rays output. It is much better than this. This is boomerang, which is a free decompiler that hasn't been maintained much lately. You'll note that not much has been updated on their page since 2006.

http://boomerang.sourceforge.net/

This github project is pretty much useless for those who want to learn about Stuxnet. Better to load the binary into IDA Freeware instead.

Stuxnet does appear to be an unusually large project (base classes, ungainly modular structure) for malware. This reinforces what I said earlier about its lack of stealth for the payload.

http://rdist.root.org/2011/01/17/stuxnet-is-embarrassing-not...

It does not appear to be sophisticated in any way except for its payload, which some evidence seems to claim was carefully constructed (e.g., with a PLC testbed). The "embarrassing" fact I was referring to in the above post is that its lack of stealth revealed its payload to the world, and no competent intelligence agency has that goal if the purpose of the worm itself is to do some damage.

Perhaps the worm is a way to draw the heat off the real deployment method. Or it is industrial sabotage gone awry. There is still not enough evidence to come to any conclusions on it, except this is not what an eleet cyberweapon would look like if you were to find one.