Misleading to say the least . . . NCIC expunges as a matter of policy with the proper inter-agency transmission. I suppose they are "free" to ignore their own policy and leave the record in place.
Is the CBP limited to the NCIC database? In my line of work, I know plenty of people that can pass a 4473 with a clean NICS check, but can't pass a security clearance.
They still know.