There's a lot of nuance that needs to be accounted for here. First off, phase one is a high-protein diet, not low-carb. Relative to other similar plans, there are actually a lot of carbs in phase one and we've arranged things so that you get those carbs from, in part, the bar and the drink.
Now, regarding the bar itself, I can see your concern and, frankly, I don't want to debate this one. If you feel funny about the bar, simply replace it with a double snack from the list.
The drink, however, is a different story. Post-workout is one of the rare times when a body benefits from a sugar hit like that. In addition to the above post,
I'm going to point you to this FAQ to explain more. 
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