They ought to get it. I say this because 'AC Bonus' is a pretty easy heading to comprehend, and doesn't really need much more explaining than that. This is also the case with the monk, where the AC bonus really isn't mentioned a whole lot in the description, and isn't listed as a specific special ability or anything either. They probably just assumed that people would realize the DD bonus is the same as the monk bonus and not worry about it. I suspect that why it was left out of the ELH is that in the hasty effort to convert every prc to epic levels they just didn't look at the table which lists AC bonus because it's next to the save and bab columns, which don't apply to epic levels.