He had predicted modern air warfare in surprisingly accurate detail—with its paratroopers and its strafing and bombing.
Not really relevant, but this seems like an overstatement. Paratroopers and bombing I can see, but strafing doesn't seem to be mentioned, and I'm not aware that using airborne grapples to overturn ships has ever happened (my understanding is that the weight ratios wouldn't cooperate).
He also seems to be predicting that only one side in any given conflict will have airships, and assuming that everyone else will just keep doing what they were doing before instead of developing strategies and technologies to defend against this new threat.
As to your last paragraph: yes, Lana could have imagined the future "one step further" by considering what would have happened when both sides of a war acquire these flying ships. In this respect, his "error" in considering only one of the two sides seems similar to one of Sun Tzu which goes something like:
...“If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself,
Rationality quotes time!
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