Most recipes add sugar to cole slaw, so yes it would be unless you've made it yourself.

The stuff in the bag, that's just raw cabbage should be fine, as long as it's not heavy on the carrots. I'm assuming the cole slaw you had was prepared with some creamy mayo type of sauce.

You could use splenda and make your own SF cole slaw which would be wonderfully low carb. Man I love cole slaw. mmm mmm mmmm...