TheABL must be within a few hundred kilometers of the missile launch point.
Since the ABL could be flying over international waters and not observed by the North Korean surveillance radars the deed can be done and look like another old tech OOPS!
I’ve long advocated that certain dangerous things and places have “accidents”. Iran’s nuke facilities, for instance, need to have a nuclear “accident”.
An “accidental” failure of this launch would have been appropriate as well.
Sadly, I am betting the ABL gets the ax, just like the ABM system will with dear leader in charge.