No, Your getting people confused. I did this yesterday and also made a video on how to do it.
1). You have the wrong code, I mean its the right code, But take out the extra ; at the end - document.cookie="VISITOR_INFO1_LIVE=qDpUsBNO0FY; expires=Thu, 2 Aug 2020 20:47:11 UTC"
2). It only works for Chrome.
3). Open YT in chrome, Right click, Inspect element, Go to console and paste that code ^. Hit enter, Restart YT on chrome and there you go.
What you need to do is, copy and paste Dynamite's link above because I think he's right the link in OP is a little off. Then, ctrl+shift+j as it states then ctrl+v+enter and you're good.