It has to be him (judging by the amount of BTC in there, I'm pretty sure this is the case), otherwise that means his wallet is compromised.
I really wonder:
1. Who is Darkstar? How did the collaboration between him and Chipmixer happen? Why did Chipmixer chose him instead of other famous signature campaign managers? As I see, he has rarely managed sig campaigns.
2. Why did he disappear after the Chipmixer incident? Is he afraid that he may get caught?
By the way, what happened to Chipmixer owner, is he arrested or is he in the list of most wanted people?
Darkstar is one of the most reputed members of the forum and he has been doing good on forum for a long time. The collaboration between campaign manager and platform representative happens via private messages on forum also on Telegram. I'm quite sure that Chipmixer representative has chosen Darkstar to manage the campaign and they both agreed with the terms of the deal.
He isn't managing any campaigns after the seizing event of Chipmixer by governmental authorities of US and Germany, but in past he managed Chipmixer and a few other campaigns. The Chipmixer incident was a shock for him as well and that's why he wanted to have some free time in order to forget about it. Whatever happened with Chipmixer wasn't the fault of Darkstar because he hadn't done anything wrong.