Doesn't really matter if the stadium shows the replay or not, both teams will have a guy that has access to the video feeds. The manager might not even be the guy that ends up making the decision, could be the guy in the video booth.
"Teams will be allowed to have a club employee monitoring video and communicating with the manager whether or not to challenge. Both the home and road teams must have equal access to all video, but no additional electronic equipment will be allowed."