It’s a hut.
https://donsmaps.com/lamouthe.html
Too bad, it’s clear that there have been watercraft for at least 800K years.
The cave may be too good to be true, regardless:
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.