CBP will make the decision, not Dept. of State, when you attempt to enter the US with the ESTA. CBP have tightened up lately, depending on the point of entry and the person, so be prepared for questions such as: 1) why can't you do the case study interviews remotely via video call from Germany, and 2) do you intend to overstay, marry your US partner, and apply for a green card via adjustment of status?