Is not a surprise that YouTube remove the dislike visualizations not for small content creators, for themselves, politicians, iNFluEnCer'S, and corporations.
But, what if i tell you that there is a way to restore the dislikes with just a browser extension.
Introducing: "Return YouTube Dislikes" this extension allows to restore the dislike visualization by using the YouTube Data API combining the Google Data API and the help of a archive. for now the extension still in development, but it works.
And it's better to install this in your browser before December 13, after that the YouTube API will be shutdown.
Here's the link of the extension: https://returnyoutubedislike.com