Thanks @wnknisely and @ryanjamurphy for the review and the info. I rarely use my Apple TV because I absolutely hate the Siri remote - and haven’t found a suitable 3rd party remote.
I read about what appears to be this same remote some time ago. A cable provider in Switzerland started using Apple TVs as their standard cable box, but their customers didn’t like the Siri remote. So they had to replace them with a button style remote that looks identical to the Function. Unfortunately they didn’t sell them to non-subscribers.