I brought DSLR and videocamera to the games many times without problem. I think they are referring to professional/commercial use (of the photo/video) which is prohibited. I wouldn't bring pro telephoto lens just to be sure.What's the policy on bringing bagpacks and a DSLR into the stadium? I read the official policy doesn't allow professional cameras but it seems people are able to enter with their DSLRs.
However they check backpacks even more thoroughly after current situation regarding terrorist attacks.