That video is a blown turbo like whistles or whirrs when you rev it, engine management light on and losing oil, I have none of those symptoms. I have exact match to your first post. No worries if you didn't get to the bottom of it mate, thanks for your message though
Mine just seems to over run on starter motor, prob 2 secs after engine fires. Seen others saying it's as starter motor wears the engagement onto the fly wheel doesn't release and withdraw as quick as it should, which sounds like makes sense. Mentions recondition or replace starter just wanted to see if you got yours sorted as either way over £150 if a simple fix possible