It means you get an interview. As with any limited access program, applicants are screened through the application process, if you meet the criteria, an interview is granted. Then the admission committee will decide out of the interviewed applicants who is granted admittance. Depending on how many spots there are to fill vs number of applicants/interviewees, likely there are more people seeking admittance than there are spots for, so yes, people may have interviews and not be admitted. On the other hand, everyone offered admittance may decide not to attend, so usually there is an alternate list so someone may get in because someone else turns the offer to be admitted down. This is generally how a limited access program works.
Hope this helps.