Judge by actions, not words. Whether or not they say they implement Islamic Law is neither here nor there - what should be looked at is if their Law is actaully Islamic or not. Whether the rulings they make are those that would be allowed in Islam or not.
No, I think I'll judge on BOTH thankyouverymuch. Sudans legal system claims to be based on Islamic Law and I have no reason to doubt them.
I expect if you sat down with Sudanese Lawmakers and tried to tell them their laws weren't Islamic you would be on the losing end of the argument.
I'm not qualified to have that discussion with you of course, but I am qualified to read what they say their law is based on and take them at their word. Then watch the results and judge them.