Let's say he wants to fix the mistakes he made in the previous days, but what could be the reason for deleting others' posts from a self-moderated topic?
The con-job is this: he deletes posts until the topic becomes pure garbage, then he deletes also OP's content and moves the trash in his personal shithole, namely Russian board. And there, his personal garbageman helps him get rid of all plagiarism evidence.
Hm. This is getting interesting. But if he wants to fix his mistakes, it's okay. However, he didn't really need to delete those topics since moderators already give him a pass and no ban for the thing he did. About mods helping him to delete these things, I guess he is tricking mods to do their job. He is deleting everything first and then making it like a spam post that is needed to delete. So, I am not sure if I can blame the mods about it.