While the person I'm responding to may be upset that 'premise' seems to be acquiring a second meaning in this specific circumstance, they are almost certainly n

While the person I'm responding to may be upset that 'premise' seems to be acquiring a second meaning in this specific circumstance, they are almost certainly not correct that OP 'want[s]' to say premises. OP almost certainly said exactly what they intended to say. The use of 'on-premise' rather than 'on-premises' even in formal texts is at least 200 years old (examples below). How much time should it take for us to accept "on-premise", rather than "on-premises"? (https://www.google.hu/books/edition/Records_and_Briefs_of_the_United_States/4EbRftoz0Y0C?hl=en&gbpv=1&dq=%22on-premise%22&pg=RA1-PA70&printsec=frontcover https://www.google.hu/books/edition/Records_and_Briefs_of_th..., https://www.google.hu/books/edition/Documents/3jIbAQAAIAAJ?hl=en&gbpv=1&bsq=%22on-premise%22&dq=%22on-premise%22&printsec=frontcover https://www.google.hu/books/edition/Documents/3jIbAQAAIAAJ?h..., https://www.google.hu/books/edition/Council_Proceedings/rLroAAAAMAAJ?hl=en&gbpv=1&bsq=%22on-premise%22&dq=%22on-premise%22&printsec=frontcover https://www.google.hu/books/edition/Council_Proceedings/rLro...).