I have been to a Delta sales pitch in the UK, and to be honest I found them to give a lot of "vague" promises - like there is always a chance that things will change, and you can instruct with us, but we can't promise you anything now!
But on the paper you sign, they will not PROMISE YOU ANYTHING
It is easy to promise you an interview
Am I missing something? For most reasonably intelligent adults it would be painfully obvious that an individual or organisation couldn't promise anybody anything that wasn't within their gift.
Sales pitches are designed to sell a product or service, it is up to the buyer to satisfy themselves that the product or service is something that they want to buy. If it says on the paper you sign (contract?) that they "will not promise you anything" then it is quite likely that they will not promise you anything. If it is a promise you are seeking, then best to keep on looking.