If the company has made a promise like this to the customer without even having a development team in place, you can be guaranteed this won't be the only dishonest piece of the puzzle.
My 2nd job in NYC was with a startup doing microfische replacement -- think laser disks and early 90s. The owner of the startup had sold a solution to a bank downtown and it was my first day on the job .. at one of client's buildings in Wall Street. It became clear that 1st day that the solution simply did not exist. The demo that got the client was using a competitor's product.
I ended up designing that solution from ground up, hugely improving on the fake demo and we ended up successfully installing the product on the original client and another bank in Long Island.
If the company has made a promise like this to the customer without even having a development team in place, you can be guaranteed this won't be the only dishonest piece of the puzzle.
Bail and don't look back.