Well, this might be why. [0] That's a Biden video hosted by CNBC Television that currently has 571 upvotes and 1400 dislikes. There there is the Joe Biden channel, where almost all videos have at least 50% dislike count compared to upvotes, and a significant number have more dislikes that upvotes. [1]
if the spin becomes "Biden wants it" without any proof, Biden videos will keep being downvoted only because those who oppose to him think he is censoring YouTube
But that's not what downvotes on YouTube should be used for
I am sure Biden as the President of the USA has the power to ask YouTube to reset the counters and call it a mistake, there would be no need to change the entire platform for everybody else
This is not about vote bombing but a recent change made today. My comment shows one possibility, to hide that the videos of certain accounts have many dislikes. There are other accounts which are subject to vote bombing that have relatively constant levels per video of dislikes, so it doesn't appear in this case I mentioned that you drew a valid conclusion.