I was watching this page yet without biased opinion of “online discourses” and the first thing I saw, even before the page could be loaded (because script was blocked): GoogleTagManager. And it is also no real decentralization as PeerTube is. The company is still the single point of failure, even with this concept of hosting on different hosters servers etc. It sounds more like an excuse for the company to not hire moderators (my opinion, which is maybe false).
I would not have downvoted your post, if it was written as YouTube-alternative in general (without focus on privacy). But that was no a good tip for someone looking how to setup PeerTube in a specific way.
While I would not recommend tor for video streaming, the speed fully depends on the route videos get streamed. Maybe you can watch in 4k, maybe 360p is not even loading or stream just gets interrupted and reloading can make thing better or worse. Overall not a good experience, but also not impossible.
I don’t know better how to host an instance better than kuebic described. But if you can tell your use case, someone of use may can give some good advises what alternatives you have to reach the same goal (in example a PeerTube community server which you access via TOR etc). But it depends a bit what you really want to achieve.