PROBLEM:

Archive logs are not getting deleted with RMAN command, and it is reporting below warnings.

CAUSE & SOLUTION:

Well, the error clearly says, either goldengate integrated captures or dataguard is used, which still need those archives.
However, We are not using any of these. It is just a standalone database, still getting the error. Then we recalled, that the database was cloned from a production database where goldengate integrated capture is used.

So to fix this, I have removed the capture processes.

Now I ran the rman delete command, and it deleted the archive logs successfully.  🙂