Quick interview process for analyst position. A couple of rounds, based on background and then cases. The response was quick from HR. Expect lots of questions on motivation for the role

Apply to the job offer, shortly the HR contact me through email, and scheduled the interview. The interview : Before starting the interview the HR told me that my profile is interesting but there is no one who can supervise me (even if i demonstrate that i can do the work without supervision), so she basically rejected my application but still wants to keep with the interview. It was a temporary contract, the offer stated "experience would be a plus", and I have the qualification and experiences. It would be more professional to directly reject my application rather than wasting time on scheduling the interview.