Interviews go through November 3rd. There are no rolling admissions. They interview everyone, make their list, and submit to the university. Administration must do the stuff which takes usually 2-3...
Unfortunately, I don't think it impacts anything. They look at the whole allotment of applications that met their set qualifications by the final deadline
There was a record number of qualified applicants this year so they have to comb through them slowly, when normally there is a clear delineation for interviews. They expect to notify about interviews...