You’re taking the piss right? Those seem like perfectly reasonable responses.
What video card is required to use it? None, it can be used standalone.
What video card to use it streaming from your PC, at least a 580 sounds okay for some games. You seem to be expecting it to lie, and then inferring truthful information as a lie because the information you held back (which game you want) is the reason for the heavier video card requirement.
It will all boil down to what kind of maintenance is required. A robot for $50k would pay for itself in saved wages in under a year, even less if it collected tips. A lot of smaller diners (Waffle/Huddle/Waddle/etc) typically have super low staffing requirements (line cook + 1 or 2 servers per shift, occasionally more) and could totally use robots due to the simple layout and standardization of the restaurants.