It’s an interview with three faculty, so a panel.
As hard as it may seem, don’t spiral!! Nothing is definitive yet- who knows what the outcome will be and maybe they are still releasing more interviews. Trust the process and give the universe time to give you exactly what you need and at the right time this is my second time applying to PhD programs, and the first time I got rejected to all (not saying that you will be!!!) but for me it was not the right time and I wasn’t ready- after not getting in, I actually moved across the country, met and married my now husband, and am working a dream job, interviewing for programs that auto rejected me a few years ago. Again, not to say you will get rejected, but unless you’re a magical psychic, you can’t predict the future and it’s not your job to. Focus on what brings you peace during all the chaos