Yes, you have it right ZKaudio...
"Non-impact" is a term that protein bar manufacturer's are fond of using. The claim is that sugar alcohols (e.g., malitol, maltitol, sorbitol, etc.,) don't raise insulin levels like sucrose/glucose do - and therefore shouldn't be "counted" as carbs.
Hence the name non-impact ----> because they (apparently) have very little impact on blood sugar levels.