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Bali and Lombok are only 18 miles apart. From the high hills of Bali one can easily see Lombok on a clear day. So they would have known Lombok was there.

Additionally, these two island are separated by the Wallace Line, named for a 19th century naturalist who showed that Australian type animals lived on the Lombok side, and Asian on the Bali side. In ice age times, the seas would have been over 300 feet lower than today, and Bali was not then an island, but the very tip of a long peninsula extending all the way from Thailand. Similarly, Lombok would have had a land passage all the way to New Guinea, which was landlocked to northern Australia. Only the depth of the sea, at over half a mile deep between Bali and Lombok, separated these two great land masses. I guess once one arrived on Lombok, one could walk to Flores and even Australia. So the key to prove if this migration ever took place is making the run across the water between Bali and Lombok.

One other point not mentioned in the article. Since the sea would have been much lower, and much of the currents and winds that flow around these various islands today would have been prevented from doing so then, how would that effect the current in this particular passage? Perhaps it would flow less Northerly and more Easterly, toward Lombok? Or perhaps without the flow being tempered through multiple channels as it is now, would have been even more swift and treacherous?

Also, if you look at the sky you will see a map of the land when the light is right. This also works in the arctic and wherever there are large masses of color. You can see a hundred miles ahead.

Sundaland