The thread is dead, the account is inactive and Darkstar isn't.
So mind your own business.Account last active is on 23rs January you can't call it inactive. Even Darkstar keep users who are offline for more than 10 days.
The thread is also not dead the last post by admin on 15th Jan. Do you want that they keep posting in thread anything?
Why don't you use their contact us option:
https://chipmixer.com/about
is Darkstar is the part of the team of chipmixer?