I do personally not think there will be any remarkable carrier suppression within this IC because it's has not a real "Double Balanced Configuration" because LO is driven single ended ( even other input is shorted to GND via Bias Circuit )
and it changes much its performance.Therefore there is no information about port-to-port isolation or Carrier Suppression.
If I were you, I consider differential configured Double Balanced Mixers to obtain good carrier suppression.