You don't understand anything about this case or about how sanctions work.
There are no "criminal proceeds" because they have not committed any crime, and they have not been accused of any crime. There is no investigation and no court case. Their accounts were frozen because the EU imposed sanctions on them. He was sanctioned for his journalism and she was sanctioned for "helping him circumvent sanctions" by paying the bills when he no longer could because his accounts were frozen. They are not allowed to contest the sanctions in court because the sanctions are not a legal measure, they are an administrative measure applied by Brussels which the German government supports and complies with.