After removing the samsung Smart TV, they can still access the server, even after turning off the Smart TV it is authorized again when it reloads Plex, I have tested with LG Smart TV and if they are deleted correctly.
So now I see how Samsung Smart TV are playing without being in the list of Authorized Devices.
I think the bug is in the general plex portal since the Smart TV when they are turned on normally enter, even though they have been removed from trusted devices for days. When I really should go to give the 4 letters for the pairing.
In the photos you can see the example: Samsung TV UE55KU6000 was removed days ago and still can access, and other Samsung Smart TV that are already deleted can still access.
