The Deimos TR description does tend to support the idea that the GTVA intended to replace cruisers with corvettes:
As the Leviathan and Fenris cruisers of the Great War are gradually phased out, these corvettes will become the foundation of tomorrow's fleet.
If the GTVA has that much money to spend, cool, but I fail to see how the Aeolus would not be a much more cost-efficient convoy escort vessel to fill some of the standard cruiser roles.
Unless the sheer flak-dakka that an Aeolus expends in a standard engagement tends to drain it of ammo, or something else that honestly limits the ship to some significant extent, yet isn't obvious to the player in a single mission.