There is content on YouTube that is not available available anywhere else. Using an alternative frontend with a local account like NewPipe is de-googling to an extend. If that is not de-googling then neither is using something like StartPage for search.
The whole point of de-googling is limiting as much as possible your data exposure to Google. Completely eliminating it is impossible. Unless you are fine with not being able to access the majority of the web due to the use of reCAPCHAv3.