Hey @Anonymous User ,
I have had a look at this and in order to check if your TV supports this, you will need to check the connectivity settings. if your Samsung TV has 802.11a, 802.11n, or 802.11ac configuration, it will support 5GHz Wi-Fi.
You are very welcome! Oh, my bad! You can check this from the TV Settings> General> Network.
Have you tried to set your router to display the bands with separate names for every band and see if that one appears on your TV?