Eh, he makes no actual implication in the existing dialog... He only says that they found something so they can actually aim Meteor (unlike before) and that annihilating the area and leaving a void of nothingness would be better than Eorzea's taint. Nothing about actually using or taking advantage of any Aether. The only existing mention of Aether is the devices found in Toto-Rak were imperial magitek machines used to measure and record Aether flow through the region.
Perhaps Eorzea is bracing itself for the impact (which is what results in the crazy distorted landmasses in post 2.0 maps), because it obviously doesn't destroy Eorzea and leave a void.
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