Yes, you can delete a Gateway device from a Hotspot. The Hotspot is still active so there would be no loss of any data associated with that Hotspot. This is useful if you lose a Gateway or replace a Gateway at a Hotspot location. To delete a Gateway, simply go to Hotspot>Hotspot List> Choose the Hotspot, scroll down to the Gateway list and click the trash can icon on the Gateway you want to delete.
Select ‘Yes, delete it’