There's a federal warrant for Minh Quốc Nguyễn's arrest but I haven't seen any news about him being caught.
The authorities will always announce if they caught criminals that have warrants, no updates mean he is still at large, and they have no reason not to publish his arrest, his arrest will put a stop to speculation that he is coming up with another mixer or he is being protected.
Chipmixer's shutdown is a piece of big media news and his arrest will also become bigger news, right now he is good at hiding I think he has an escape plan if ever things got worse.