In the meantime, a documentary by Nicolas Wadimoff was released last year and Al Jazeera have announced an abridged version. See it here while it lasts (until 14 August 2019). Frankly, I could do without the cheesy philosophical interludes but the film does offer a few excellent insights into some of the context and characters involved.
My personal thoughts? I suspect the statue is authentic (ancient Greek or a Roman copy) but its condition does not seem to suggest that it was lying under the sea for centuries. I tend to think it was originally found on dry land and perhaps, as one of the people in the film speculates, dropped overboard for some reason while being transported in modern times. It's quite possible it was being smuggled by boat between two other countries and jettisoned or lost off the Gazan coast when the venture was inconveniently interrupted. Who knows?
At any rate, whatever its origin, my two greatest concerns - assuming the statue really is authentic - are that it is likely to be in urgent need of conservation and that it eventually ends up properly curated on public display.
My thanks to Michael Press for publicising this news.