It’s a hut.
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I guess you are not familiar with how ships in heavy seas appear - it is definitely NOT a hut. Huts do not have central pillars with cloth set in sail fashion nor do they exhibit people, carved bowsprits, nor trailing lines. The ship ties in with the placement of various worldwide megalithic stone structures which can be seen from the sea, providing navigational markers. The representation gives a better validation to what ships may have looked like 800,000 YA, of which there are no known examples of that age, rather ships are implied by various pre-human migrations.
Even if one object in the cave may be a fake - which the article seems to say, even though it is not proved but supposition, does not mean everything is a fake.
I guess you're not famillar with how huts have appeared. The cave's got some formidable fortification nowadays, the only reason for doubt about the lamp is that one modern fake, I don't think the fakery extends to everything, just that the cave hasn't been open for proper study by the look of that and the number of photos taken of the lamp. It's not a stretch to think they really did have lamps in caves.
As I said, I'd love it if it were a representation of a ship, but among antiquarians, the view is, it's a hut.
The reason seafaring is known to be at least 800K old is, Flores Island (now better known for Floriensis) has artifacts that old, and during the currently accepted time of humans/hominims the island has been divided from the mainland by some miles of open water.