You must be talking about the Atkins bars. They are not part of the Atkins diet, by the way but that the manufacturers of the bars have purchased the logo.
Sugar alcohols affect diabetics differently. For some, no rise in BG, so they count zero. For others, they do raise BG. You'll have to see what happens for you.
I'm one who can't eat even 1/4 of a bar without a rise in BG. Along with almost everyone else, in the beginning I tried and liked them and thought they were great. But in the end I had to put them in the "not safe" category. But - YMMV.
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net carbs vs total carbs: this is, again, a YMMV. I can use net carbs, but others have found that they have to calculate the total carbs.