Holocaust deniers have every right to speak their views in the US. They don't have the right to demand a specific platform; just like they can't demand an oped in the New York Times, they can't demand Patreon carry it.

I also subscribe to the concept of the paradox of intolerance (https://en.wikipedia.org/wiki/Paradox_of_tolerance) - that having a tolerant society requires intolerance of certain beliefs. There's some good evidence that deplatforming works. (https://www.vice.com/en_us/article/bjbp9d/do-social-media-ba...)