I wrote about him before. But I don't know why people started downvoting me. If you check his previous contests, he has zero submissions but a positive delta. Also, in his previous submission, he has submitted the same problem's solution in different languages. Someone told me his rating will be gone in a few days but it's still there and he cheated again in the last Div-4. If you go to his submissions for the last contest, you can clearly see he used AI. It's his CF handle: md.reduanur

UPD: Maybe this cheater's group started downvoting again. No problem, keep going, you cheaters.