It looks like they did reverse the slope. It's pretty evident in the first picture of Firebat's second post. TCS must have been battling dyslexia, as they put the headlight on the wrong fender as well (it should be on the left). Other rivet counting errors I noted were the deletion of the gun travel lock and the drivers vision blocks.
The darker paint on the Normandy version looks very nice though, and overall it looks good and comes with shurzen, so I think I'll still be picking it up despite these minor errors. Honestly, most tanks I have from TCS or King and Country have some sort of minor error to them. I think FL does a little better job on the exact historical accuracy of AFVs, but at 2-3 times the cost of a TSC tank I can overlook a minor error or two.