That overstates the threat.
Tank farms aren’t that easy to take out, since the tanks were spread out and in revetments to prevent damage from one tank from spreading to another.
Also the Japanese were in no position to invade and occupy Oahu. We still had two over strength divisions on the island.
Kido Butai was at the end of it’s tether having just enough fuel to get to Hawaii and back. It did not have near enough fuel to hang around the islands launching the repeated attacks needed to prepare for an invasion.
And the IJA never launched a successful opposed landing during the war. Their landings were in remote spots with few defenders.
Furthermore, the shipping needed to move enough troops to launch an opposed invasion of Oahu alone, did not exist in Japan. Especially since the ships they had were needed to carry troops to the Philippines, Malaya, and the Dutch East Indies.
Finally, the Imperial Japanese Army, the vast bulk of which was committed to the war in China, would have flatly refused to participate in a operation so far removed from the main theater of war.
Good summation.