I think the issue he's talking about is more along the lines of "hey we promised X _and_ that we could deliver it in Y" when Y is an unreasonable amount of time. Situations like that almost always lead to death marches in my experience.

hopefully you will never see the the salesperson charging into the engineer meeting yelling "I promised the customer 6 months ago that we would ship this feature in 3 months, where the hell is it" at a sea of faces that had clearly never heard of any such thing.