The conditions that processors run under in situations like military equipment are drastically different from those of consumer devices. Consistency and stability are more important than performance in those contexts. So much so that RTOS systems like VxWorks are popular in that space. They’d probably already have features like clock boost disabled (or use processors completely lacking it) in favor of a lower fixed clock speed, probably avoiding these issues entirely.
It was released. The Azure Flute and the event where you meet and battle Arceus in the Hall of Origin in DPPt was indeed never released, but this is different.
Arceus had various distributions in 2009-2010; the US one was at Toys R Us for example. Trading that legit Arceus to HGSS and then bringing it to the Ruins of Alph triggers this event which takes you to a special location where you can choose one egg of either Dialga, Palkia, or Giratina.