Vitalograph interview questions

The interview process was efficient and well-organized, featuring one onsite meeting with several engineers for open discussion and questions, plus a single online assessment, creating a straightforward and positive experience.

I had an interview with them and had a good rapport with the interviewer and he told me he planned to progress me through the next step in the interview process. 3 weeks go by and nothing, but this is right after Christmas and New Years so I email HR contact to see if there's any update and they say they'll check with hiring manager. Another couple of emails a week and then 2 weeks later to multiple people in HR and they ghosted me, won't respond.