By default many devices give the game away by hostname....xbox, ps4, enigma2, zgemma etc so renaming your box will cut the chances of your ISP knowing just by its hostname what the device is, you can rename your devices to anything you want....mytv, xbox, bobs box, dodgytv, stuffyouVirmin etc...anything you like so its not important to use any official hostname for another device. In my case I have changed my Edision OS Nino to Edi & my Zgemma H7 to Gem (not exactly creative names but it doesnt matter imo)... many leave the host names as default & have no issues as they are in essence a free to air set top box.
It's only when you contact your ISP for support that the guy/girl on the other end of the phone will have a good idea what the connected devices are & make an educated guess what you are using it for.
As far as I am aware your ISP is permitted to see hostnames (& possibly mac addresses) but not allowed to dig any deeper without specific permissions or they would be breaking data protection laws