That's totally correct dre, build number does not correlate to when it will actually be built. Ford did the same thing with the sprints, there was a bloke on their forum who had a very late build number and it turned out his car was made right at the start of the batch, he wasn't too pleased lol
Build number allocations should have been done before build dates so the number actually means something, but I don't think Holden care too much tbh
Australian made Holden enthusiasts are dinosaurs in their eyes, very sad.