The vast majority of schools won’t do a financial aid pre-read, that’s what the NPCs are for.
If the BU NPC looks affordable, and BU is the student’s number one choice, why would the student give up the ED acceptance rate bump just because they can’t get anything more specific than the NPC?
BU’s NPC is pretty detailed which suggests some level of thought and probable accuracy. If the student’s not accepted and the FA package not affordable, the student moves on, no questions asked.