I don't think the stripe is painted wrong.
I went to that earlier thread and studied the photos carefully, particularly the still image/profile posted by BigJim.
I don't think the stripe is painted wrong. I think the rear of those locos is mounted too low. I took the photo BigJim posted and ran the red line you see below right along the stripe on the loco. Note it slopes down across the tender. Note also that the roof of the cab seems too low to match the tender height properly. If it were mine, I'd just insert 1/8 inch spacers around the screws between body and chassis at the rear. Its a simple, five minute fix, I imagine, and that ought to fix it.