Pretty sure the bus did not say POSSIBLY. Also, what is wrong with mentioning the downsides of something? It is a possibility that those things would go if we left, as is happening now with such a two faced government.
Neither did it promise the £350m to the NHS .... go and read the wording.
But you stated the vote WASN'T about leaving the SM, the CU or ending FoM so why mention the downsides of something we weren't voting about ?