Yes and for composers, many music schools, including top conservatories, don’t require an instrumental audition at all (or voice, or piano). You do have to have a portfolio for conservatories, and usually an interview. For colleges, an arts supplement suffices. The piece didn’t mention composers specifically.
I think for any applicant, instrumentalist, vocalist, composer, a key thing during high school is to do something outside of school- conservatory prep for instance (we did it only the last two years of high school due to cost). Youth orchestra. Get with peers who are talented and working hard and the path will be clearer.