good video clip! now there's a lesson for those who want others to actually see the problem they are talking about.
that said mine definitely doesnt sound like that. thats a pretty noticeable clunk. we have different boxes (i got the newer 6sp), but still... the old box didnt sound 'that' bad. yours reminds me of the older 4 speeds.... horrid things
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when you presented the car for a warranty repair, did you write in your own words on the customer instructions the exact problem?
because its my understanding that if you present your car for a warranty repair during the warranty period and they dont fix that problem, the warranty still covers it even though the warranty lapses.
my point is document everything. go to another dealer if you have to, so later on if things get nasty you can show that there was definitely a problem with the clunking noise (plus now you have video footage and a post date on Utube) that they didnt fix because they could see the warranty was just about to lapse.
but again, that clunk doesnt sound normal to me. its not on my car, and its not on other cars ive driven.... it sticks out like a sore thumb and reminds me of an old clunker bomodore.
you could also try a 3rd party transmission expert and ask them to give you a written quote/diagnoses that you can then take to holden as proof that theres a potential issue.
document everything mate. drivetrain issues can get very expensive very quickly.