Your eBay order should be fine. The Koreans know how to work the system. B&H has the same 2-4 week estimate on all three of the Mavic 4 Pro versions. Can't see how they can get them in 2-4 weeks and
also sell at $4650 when Adorama has no future date specified any more, and is at $5500 because of tariffs.
Only constructive criticism of your photo wouldn't be the ISO, but the composition, where the mast of the sailboat cuts into the building behind it, hiding parts of it. If you had moved to the right, to keep the mast on the far left, away from the building, or just cleanly remove it now, it becomes a stronger photograph. Lettering on the building is messed up in this quick edit, but it becomes a stronger image with the mast gone, not obstructing the building behind it.
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