The west coast, where I work, does not have any real number of X, and haplogroup M is a quite recent discovery in British Columbia (just last year). It certainly is not yet understood.
I think the map is misleading because 1) there are two different D lineages (based on recent discoveries). One is coastal the other probably interior. And 2) the A seems to have been coastal.
The NG map, and Oppenheimer's as well, jumble them all together. But that's to be expected, as the discoveries are coming very quickly now.
Maybe.
I just figure these maps/publications are for the general population like me, without the finer details and not for experts like you. LOL, I work at this and I can't keep things straight. So...