I looked at the webpage and it appears to be a statistical reporting issue. Of the 145 med schools that participated in the questionnaire, only 143 answered the question–at-all-- about surgery. (NOT answered the question as no.) This means the status surgical rotations of the remaining 2 programs is unknown.
P.S. @Brandonlee0224 You will be exposed to/ be required to participate surgeries in other clinical rotations besides surgery. OB/GYN always includes obstetric (C-sections) and gynecological surgical procedures as part of the med student rotation. You may be required to participate in/observe surgery even in non-surgical fields like peds. (D1 observed/assisted in pediatric orthopedic surgery for a full week during her pediatric rotation in med school.)