Without a doubt, that's our world-famous WG rattle. Your noise is plainly obvious; I'd doubt the dealer you bring it to would try to pull the "it's normal" spiel.
There is a middle-ground alternative that dealers may try depending on the diagnosis though. The software fix is the first. After that they may adjust the waste gate actuators to try and get rid of the noise.
If that doesn't work (or that fix doesn't last), that's when I've seen them pull the snails and completely replace them.
Good luck op, here's to brand new turbos!