You are not a bad poster tbh but you should not be spreading false informations in the way you have done here. Due to that you are being removed from the campaign.
Sorry bro, nothing wrong with @arimamib post, here he was talking about the total post, and why it can be minus post for users. Its not spreading false informations. He just wants to let other members know, how the total post count end of campaign each weeks, because sometime, member can lose their number of posts. IMO, he still eligible for your campaign, since there is no false informations, i think you have to translate their word better,

But, in the end, you and your team have the right decissions about him, but for us here, his post isn't wrong.
Accordingly to the 3 online translators I used he was saying that the best poster prizes are given for those with the longest posts & the highest quantity of posts.. and that's the major issue here as its absolutely no true.
Anyways, if these translators are wrong, I apologize for the mistake. In any case, I will forward the entire thread for our Indonesian translator to do a meanful translation & help to clear these doubts (and, in case he confirms that he was not spreading wrong infos about the campaign, I am up even to give him a bonus for all the trouble it caused)