From the picture, it looks more like chipping to me, but maybe I'm wrong. I would need to see a much more magnified image to be able to tell that it's pitting and not chipping. Also, VG10 has pretty good rust resistance. If it is pitting rather than chipping, most steels would do this anyway. On the other hand, HRC 61 is probably higher than VG10 should be run. They really should be shooting for 59-60, otherwise it can get a bit brittle. Out of curiosity, do you push food around by dragging the edge across the board (laterally, especially immediately after a cut)? Do you rock chop much? This is all generally a bad idea with hard and thin (that is, delicate) edges.