Bike noise, creak, click, creaks, clicks, clicking, pinging sound - help

from what I can see in the clip it's one of those half link chains which have a slightly different profile on one side like this:

So I'm thinking he might have put it on the other way around and something could be rubbing as the links articulate around the rear cog - just a thought.

Didn't think all halflinks looked like that?

Just sounds dry to me, put a bit of lube on it and see.