I can reasonably assure you that the fan is not pointed at the PS3 because some developer created some buggy code.The same is true here: unless someone has inside knowledge on why that machine has a fan pointed at it, you can't reasonably make any generalized remarks. It's not like the demo machines are running in their typical operating environment.
It could be that the fan in the demo unit failed, causing it to overheat, and the next best thing was an external fan. Regardless, there is a fan pointed at a non-working PS3. Last time I used a fan it was not because I was just fine and felt I needed to run a fan.
I think Sony's hardware track record speaks for itself. The launch will be fraught with quirky hardware and sob stories that blow up all over forums. Then the second version of the hardware will be fine and only need an occasional motor replaced.