You're being fed misinformation from this individual. The ending CG location on an asymmetric ball only effects static weight in regards to legality. In your case, it does not sound like it required any additional weight holes. In addition to that, the ball reaction characteristics of that layout for you will be determined by pin and mass bias positions in relation to your axis point. It is not uncommon for people with short horizontal axis points to have pins, cgs, and/or mbs to the left side of their grip (for a right hander). This does not mean the ball has a "negative drilling" as someone with a longer horizontal axis could have the same layout numbers and be located on the "positive" side of the grip. The only possibility is a ball could end up with negative side weight if the cg is left of grip (for a right hander), but if the ball remains statically legal, then it has no bearing.
BTW, great ball choice!