It is not like it is censored in Sweden, it's just someone holds the distribution rights in Sweden for South Park. So, they cannot show it to you on their website.
So, there is no irony here, it's copyright issue, not censorship issue.
It is at least pretty interesting that the end result of repressive censorship and "free" market capitalism seems to be the same: limitations on what you can see or hear.
To the average human, it doesn't really matter if it is the state that prevents you from seeing something or the forces of market capitalism. You have to do something illegal to see it either way, and you will be punished if discovered.
Copyright law is the antithesis of a free market. We participate in a fairly regulated market. I'm not advocating for a free market, but blaming this on the non-existent free market is just targeting the blame in the wrong direction.
The difference is that in capitalism you can pay the owner to see it. Most of the people who are blocked from one source by copyright probably have it available on a paid streaming service.
As the current market shows, you cannot always get the content from the owner. Some TV Shows are unavailable and the owners are unwilling to release them for whatever reason.
So, there is no irony here, it's copyright issue, not censorship issue.