Hi,
Thanks for the research on this. To address a couple points:
I do not know the hotel chain. My feeling is that the service was available to hotels in general if they chose to subscribe, rather than being geared toward one specific hotel chain.
The YouTube videos you found are the EXACT ads that are on my old tape. The YouTube clips surfaced maybe 5 years ago or so. I reached out to the poster, back then, to see if he had more information - this was back in the days when YouTube users could message each other. The poster told me that he got the tape in an estate sale, if I remember correctly, and he was convinced that someone recorded it off TVRO. My best guess is that it was around the same time my parents were rolling tape off their own TVRO - perhaps even the same timeshift.
I also found this post, here on the Satellite Guys forum, indicating that Guest Cinema was occasionally in FU (full authorization?) mode.
So, that's my best guess as to how my parents came across it on their TVRO (and probably the YouTube taper). I recall that my parents had a VideoCiper II. This would have been roughly from 1987 until 1991.