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That intake manifold bolt that's right in the middle of the video is supposed to be connected directly to the battery with the heavy gauge ground cable. It's one big cable that goes from battery to the chassis right below the battery tray to that bolt. Without that the starter is relying on a much weaker ground path, unless you relocated the battery and added a new dedicated heavy gauge engine ground somewhere.
When it makes the high pitched "whizz" that sounds like the starter bendix isn't fully extending so it's spinning the motor but not making flywheel contact.
It's a new starter but it's not an OEM starter, there's a chance the starter could also be a POS. Lots of aftermarket and reman starters and alternators are defective. My car has a reman starter and it works but it kinda... sucks and cranks slowly even though my battery is good and engine is healthy.
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