It's actually much worse than 4:1. YouTube is often hiding upwards of 90% of the dislikes. Like another poster noted, you can see it on https://81m.org/ .
This seems like a pretty baseless conspiracy theory.
This is also prevalent on those very scripted SNL-type 'comedy' channels that always make it to the front page, or vaccine safety videos (YouTube keeps showing me these videos of black people taking/administering vaccines in a propagandized way because they think I'm an African-American antivaxxer?). What's strange is these channels will have millions of subs but very few views, always with about 6:1 downvote:upvote.