We don’t exactly know what happened before she put her hand on the camera, was she only annoyed because she had to scan the items again? perhaps there is more to the story.

I’ve used this loungebox type of thing as well in the past at Schiphol, I have to say it can be a bit confusing because you can only take specific drinks or salads/sandwiches depending on time of day. Also for cashiers it can be complex.

Other than that, it seems you have to take your loss on this one. American Express literally doesn’t care, doesn’t matter how long you are a member or how much you spend, it’s all “fake status” in the end.