Yeah ChipMixer are in a similar country to another service in a similar secter going since 2013/2014 I think they should be pretty safe.
As a side note if you want to keep your legally gray actions secret, don't register a domain in Europe lol because this happens.
This is disapointing of europol and the Netherlands. They clearly don't understand the significance of these sites and how mixers work in a way cash does.