At the beginning to the video, there are pallets that say "Hayes Metals"

So, I decided to look up "Hayes Metals" and lo and behold, it is a foundary operation in NZ:

https://www.hayesmetals.co.nz/nz

They do all kinds of alloys. It looks like this might have been some kind of test/experiment/who knows pour to show off what they do... They pride themselves on their quality...