You make good points regarding Mark. He has owned up to it.
That is more than can be said for his half brother 0.
When has 0 ever owned up to cheating; what status did he claim in order to go to school, such as foreign student (recall the Bio given to literary agent; claimed born in Kenya).
That’s just one area for starters.
Not to mention the autobiography and memoir ( written BEFORE becoming famous, I might add) that wasn’t really written by him.
0 is a cheat and a liar who wouldn’t admit to any wrongdoing even if someone got all in his face about it.