Afaik, they know where to appeal and they are aware of Chinese forum.
They are just anxiously want to get unbanned so they just post everywhere. There are even rumours saying chinese gm/mod have no access to ban appeal, that's why you see so many "translated" ban appeal, thinking english is the only way to communicate with the team.
In some cases, their appeal has been rejected, so they thought they could appeal again in english forum.
*Above is my own thought after reading all those ban appeal posted in subforum, and is not from any official team*