I believe that color gel coated bottoms has been an option for some time. My 1992 C dory 22 had blue gel coat, under the epoxy barrier coat, which was under the bottom paint (from a previous life).
I have sort of made a hobby of following the osmosis issues for a number of years. I have seen a couple of boats (out of many hundreds/thousands) which were "Ruined" by osmosis--blistering. But this is not one of those. In those boats, the blistering was so severe that holes developed in the laminate.
Basically there are two ways to treat blistering--one is to patch the blisters as they occur (We have found that shallow grinding with a carbide bit and building concentric circles of cloth with epoxy was the best way, they fairing with high density filler), the other is to do a "peel" with a carbide cutter, remove the gel coat, and often the first layer of mat. Then rebuild the bottom with epoxy (and occasionally a layer of cloth). There are several unique problems with this on the C Dory. One of these is that the boat is gel coated, and has not bottom paint, so the first alternative is not attractive. The second means that you will probably end up with bottom paint on the boat, after the epoxy coats and the bottom is refaired if you go that direction. The peeling process is not cheap or easy. The boat has to be dryed (which means either hot vac,& wash) or dehumidified in a heated environment.
However, it is unusual for "typical" blistering to occur in 9 months. This makes one think that bonding of the green gel coat may be an issue--and hopefully that the blistering does not go below the gel coat. (In many of the long term blistering cases, the blister can be deep in the laminate). It will be very interesting to see what these blisters contain, and how deep they are.
Another issue is that I belive that most of the C Dories are balsa cored. Because of the thickness of the laminate, problems with the balsa or plywood have been minimal.
However, I am surprised that one one has mentioned a moisture meter. What does the moisture meter show? There can be falsely elevated readings when a boat is just hauled --generally one waits a few weeks to look for wet areas in the bottom. Metal objects inside the hull and bottom paint can also give erronous readings.
Good luck and keep us all posted on what the factory says.