That is just another question in a long list of other questions about exactly what happened. If someone wanted to create a mixer or anonymity based service they should at least have researched about that. As you said, to have hosting based in a jurisdiction that could damage the privacy promises they made to their customers is basically contradictory and counterproductive to their aims.
Well in my point of view if "he" or " them " worked way more professional then why did they choose an " onshore " hosting even if its maybe one out of X servers in their internal structure.
I mean choosing such an jurisdiction for hosting such a website doesnt make any sense. I mean we talk about hetzner which reacts very strict to any kind of abuse against their ToS and chipmixer/crypto falls for sure under their terms.
So imo i think they didnt even work properly from the beginning when choosing the server location. They might have some technical knowledge to setup the infrastructure but they didnt even think twice about the server location itself.