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Does anyone know if this is basically the same sort of Algorithm used in say the age of Age of Empires and Age of Mythology games?

Yep! It's based pretty heavily off how AoE and later games do it.

Are those games open source or has it been possible to reverse engineer the algorithm, or ...?

The original 0 A.D. pathfinder was based largely off reverse engineering the AoM one. [1]

Engineers have presented some of how their algorithms work at conferences and in other places.

Know of any video links to talks that you could share?