Yet more proof that oil does not know how old it is.
This oil was likely not changed prior to sitting 10 years, and yet the lube itself is fine.
Yes - it's possible (probable?) that some amount of rust (Fe) may be present in the interior of the engine on some surfaces like cylinder walls, exposed cam lobes, etc. However, that wasn't really the quest here. ST2008 was wanting to know how the OIL was, not the engine.
Also, there's a UOA thread here that's from a few months back where a 10-year sitting period was experienced by an older truck, and the engine was started, and then the UOA was taken. And yet it was OK; indicating that not only was the oil OK, but also the engine.
Ryan Stark will tell us this is because engines over the last two decades are "sealed" much better than they used to be. The ingress of moisture ins't nearly as bad as many decades ago. Sealed PCV systems, tighter clamps, hoses more resistant to rot, etc, all contribute to an engine that can endure sitting idle (not to be confused with idling), for years and years. That and fuel/oil contributory issues like sulphur are much lower than decades ago also. It's not that one factor is the key; it's that all the small improvements add up to a more desirable result.