Images displaying third-party ownership or branding not deleted - Our Miss Brooks

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 Our Miss Brooks, such as this one: https://www.imdb.com/title/tt0044287/mediaviewer/rm1755060737/ 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: #250714-223247-367602 #250714-223256-109502 #250714-223304-307202 #250714-223313-249602 #250714-223321-453602 #250714-223330-974602 #250714-223345-848102 #250714-223353-903202 #250714-223401-250402 #250714-223409-382802 #250714-223417-211202 #250714-223430-717002 #250714-223439-054202 #250714-223447-998902 #250714-223501-515702 #250714-223510-240802 #250714-223518-655002 #250714-223528-271002 #250714-223543-302402 #250714-223552-922502 #250714-223603-035402 #250714-223611-600302 #250714-223625-179102 #250714-223634-044002 #250714-223643-716202 #250714-223653-487202 #250714-223815-229502 #250714-223830-420202 #250714-223838-830702 #250714-225601-804302 #250714-225613-241902 #250714-225625-349102 #250714-225637-635602 #250714-225648-095502 *all pictures had a watermark from Decades, a network that started in 2015 while Our Miss Brooks is a 1950's show, a fact I pointed out in each and every contribution.