EnofTaiPeople, CJ_xde_pt, CJ_xde_lt belong to the same person (which can be easily verified, since all their submissions start with exactly the same macros and fast IO). These three accounts all attended at least one contest since June, which clearly violates the rule.

What makes me want to say this in a public blog is that, he recently posted a video (this video is in Chinese) of himself using a second account to have an additional 4 hours in the USACO Plat this December. In the beginning of the video, and in the comment section, he explained that he feels it's lawful, and he has the right, to create a second account and resubmit the code after debugging them. Later on, after his USACO accounts got banned, he started to act cool and spread hate in a group chat when asked why he would do this.