lol, dude lost some cred that a OEM chain only lasts 10k miles. I've got 30K on my OEM chain on my fz6. (it's probably due, but it's not in bad shape and last season the mechanic looked at it when I suggested a replacement and said it was fine.)
The holes in that rivet chain look frightening to me.
He also failed to say hook the master link to the old chain so that you thread the new chain on as the old chain comes off.
It's been years since I've done one of these.