Heart Aerospace Flight Control Systems Engineer interview questions

The interview process was actually started really good. The technical interviewer was really nice and supportive. After that, I was called for a meeting with the CEO. All of these process happened between the end of August and the beginning of October. Up until that point everything was nice. However, I am writing this on 31 January of the following year, and I am still ghosted. No response at all. No negative, no positive, no nothing. I can't understand why a candidate with two interviews can be left without any response at all. And the job advertisement of this specific post is still online.