The certificate program is for people who were waitlisted in the previous cycle. So when they say
"Of the 42 students who completed this program for 2016-2017, 11 PREVIOUSLY waitlisted students gained acceptance for August 2017"
It means that 11 students who were waitlisted in the PREVIOUS cycle (2015-2016) were automatically accepted this cycle, i.e- never occupying a spot on this year's waitlist. Same goes for those that interviewed, of the 42 students, 16 were interviewed and 7 of those were accepted without being waitlisted. Don't lose hope, my fellow gunners.