The Help information shown here "was" correct when I was using Spotify Free. Then I decided to try Premium Trial and the interface reset. Now I no longer have the Like/Dislike buttons.
Plus, when I set up the Playlist Radio station, I received a very useful display in which I could see a preview list of the songs that would be played. With that I had the option to listen to (approx.) 10 second audio sample, and on the ride side had the choice to "Hide" that artist. This is what convinced me to try out Spotify. Now, that preview is gone. Now, I have to accept whatever the station wishes to offer.
Android 9, on a Pixel 2. USA. Three month Premium trial.