Robin,
I do understand what you are saying.
If the crew had intended that Waypoint A was being marked as an LZ (or even a DZ or Final Approach Fix), then the slight misplot may have been critical in the prevailing weather conditions.
If they intended it to be the approximate position of a turning point, the small variation in the two positions is irrelevant.
We do not know what the crew intended. Without that information we are speculating.