I actually fully believe that youtube removed the dislike function from being publicly viewed to hide the backlash The White House youtube channel was getting since Biden was elected.
I payed attention. They removed the videos but Trump had hundreds of thousands of viewers and engagement with a mostly positive like ratio and comments. As soon as Biden took over he had 5x-20x as many times the dislike to like ratio. It was setting youtube all time records. They had to erase it. Too obvious.