I feel as if youtube itself might still contain some tracking.

People recommend invidious and piped but they are starting to have issues.

This video is archived on wayback machine (archive.org) and I feel as if that might be the best way to watch this video right now.

https://web.archive.org/web/20260207024055/https://www.youtu...

Edit: I have also uploaded it on preservetube when I got interested in what are some wayback machine alternatives (given that wayback machine suggests to not upload videos given storage constraints unless absolutely necessary)

So I found preservetube which is sort of intended for this and uploaded this video on it

https://preservetube.com/watch?v=l4dCJJFuMsE

Spyware?

Not OP, but the "si" parameter in the URL is an individual tracking identifier, generated specifically for YouTube to see who you share the link with.

TY

GP means the si url parameter, which is a token that helps google track how their videos are being shared.