Those molded in non-skid patterns are originally put on the plug (original form of what the boat will be), from which the deck mold is made. Every boat off the mold has the identical non-skid "molded in", as in its as much a part of the original boat as the gelcoat color.
I've seen a repair solution, but never used it. They have some videos on their website of how to use their product to repair. (That's assuming they have the matching pattern for your boat...)
There are a lot of other methods to repair a deck and add non skid, if you want to match what the boat originally had your option is to find something like the flex mold product. And have the familiarity with fiberglass work/finishing and gelcoat, and color matching gelcoat if you are trying to blend it with existing deck.
Part of the answer lies in what are you trying to repair? Is it a soft deck project where you have to tear it all out and replace, or a damaged area from a dropped object that you are trying bring back to what the rest of the deck looks like. I looked at the flexmold product, and determined it would be cost and time prohibitive to use it on a deck replacement project I did on a 19 ft cuddy several years ago. That boat got gelcoat with a non-skid additive mixed in.