They did not remove API yet. I believe they intend to remove it sometime in December, after they complete rollout of removing dislike counter globally
>Hey there, I have just checked the Youtube's official change-logs and it seems that they will stop providing dislikes in the youtube Data API. That's why I am launching an archiving API that will allow anyone to see dislikes of any videos. This package will keep logging number of dislikes of any video and feed it to the API. In future, we will do something even better!