How does an after fact of someone's supposed illegal activity become itself illegal in a case like this? Especially in Brazil if I'm assuming correctly.

I never heard of a case declaring a non-circumvent tool to be illegal just because it may indirectly rely on people dumping it first. If so, then even project64 would be illegal too as bypassing a physical cartridge was ruled to also bypass copy protection.

Also the tool was in another specific country, which I heard doesn't have copy protection laws so the idea that it itself becomes illegal because of the actions in another country sounds even more silly.

I am not a lawyer by the way.