Images displaying third-party ownership or branding not deleted - Centennial

According to the image guide (https://help.imdb.com/article/contribution/images-videos/image-guidelines/G27LPBQZA7EAZGJW?ref_=helpms_helpart_inline#) "Images displaying third-party ownership or branding, such as watermarks." are not allowed.* For that reason, I tried to delete photos from Centennial, such as this one: https://www.imdb.com/title/tt0076993/mediaviewer/rm4150863104/ but my contributions were declined. Was this in error or does IMDb have a different idea of third-party ownership and/or branding than I do? These are the submission numbers: #250718-115435-442102 #250718-115447-390002 #250718-115456-324202 #250718-115505-467302 #250718-115514-439202 #250718-115523-554602 #250718-115532-148202 #250718-115541-041002 #250718-115551-279302 #250718-115600-055902 #250718-115609-854602 #250718-115618-080002 *all pictures had a watermark from Starz, a network that started in 1994 while Centennial is a 1970's show, a fact I pointed out in each and every contribution.