reeead's journey

I had a job interview back in March for a position that I felt went exceptionally well, but unfortunately, I didn’t get the job. Today, I received a call from the same person who interviewed me, who would have been my boss, informing me that they have two new positions opening up. Since I was considered a top candidate previously, they invited me and another top candidate to an informal lunch to gauge the vibes and possibly discuss things further after lunch. They emphasized that this isn’t a second interview and that they’re already aware of my skills and how well I connected with the team during the first interview. I’m feeling a bit uncertain about whether this means I have the job already or if it’s just a casual meet-up that might turn into some sort of competition. To manage my expectations, I plan to treat this as a lunch interview but will prepare myself for the possibility that it might not lead anywhere, just like every other job interview I've attended. I’d appreciate any thoughts or advice on how to approach this situation.