As @svantana mentioned this unfortunately does not remove any personalization in Song Radio, etc. As long as you're logged in, these auto-generated playlists will contain exactly the same (personalized!) list of songs, regardless of whether you open them with or without the `si` and `utm` parameters. Removing `si` and `utm` just removes marketing / referral tracking information.
That's a completely different thing. Playlists will be personalised as long as you're logged in, which you must be to listen. Even their public playlists get reordered automatically based on your account history.