Best deport all Swedish politicians in parliament in 1990: https://archive.nelsonmandela.org/index.php/za-com-mr-s-24 And the party that this minister is in was against supporting the ANC and Mandela. So I would not be surprised if this argument won’t move him.
Note that he is not sentenced for the burning itself exclusivley, but all the context of his actions. For example, in his “critique of islam” as he probably would put it, he generalize it to “arabs and africans” and he, according to the court, insulted a person present at his demo “based on skin color and ethnic background”. As I understand it, this was a big part of his demos; go to a segregated area, yell insults at non-white people to try and make them angry. This is also what seems he is, at least partly, sentenced for.