The options gr5 is referring to are in cura, not Netfabb. It's been a long time since I used Netfabb so I can't quite remember how to use it properly. You could maybe try to put it though Netfabb's cloud service and see how that goes?
https://netfabb.azurewebsites.net/
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gr5 2,224
Try slicing it anyway. Carefully check those layers in slice view to see if it has a problem. Consider checking "fix horrible A" or "fix horrible B" but only if there is a problem.
Usually the red areas are extra parts that can be deleted, but I'm not sure.
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