The additive package used is an approved D1G2 (now D1G3 in the No VII PCMO line) and API SP / GF-6A additive package. High Performance Lubricants uses that additive package as a base foundation and then top treats to reach the performance level they're looking for. They also use base oils that are superior to the base oils used for the certifications. They cannot use the actual certification since they deviated from the approved formula, despite that deviation being for the better, but they can say it meets the requirements because it does. HPL would have to go through all of the testing for their own oils to be certified which is very cost prohibitive. The ROI isn't there to fork out the 6 figure cost to have the testing done to certify their formula. Then if say a year later, they test out a new AO or EP additive and find better performance with it, they'd have to do that expensive testing all over again to be able to add it to their existing formulas because they'd be deviating again. It's not worth it.
The unfortunate thing about those certifications is the almost monopoly that's put on them. You won't find many, if any, major oil brands testing their oils for those certifications. If they are sending it out for testing, or doing their own testing in house, it's usually profit/bottom line measure rather than a performance seeking one. There are very few exceptions. Most of the testing for those certifications is done by the additive companies like Infenium, Lubrizol, Oronite, etc... They put together an additive package and base oil blend, send it out for certification/approval testing, and then sell that additive package as an approved add pack to the oil brands who then blend that additive package to the base oil blend used for the certification, or variation allowed within, slap a starburst on the label, and send it out the door. There's a few add packs that get certified and thus some variation between brands depending on which they buy and use, but they largely perform similar to one another. This forces all oils with that certification into the same small box chemistry wise.
Say a brand wants to add ester to their formula to increase the heat and shear stability, reduce volatility, and improve cleaning ability, if the additive package they're using was not tested with ester in the base oil blend, they can't use it and keep the certification. Even though the oil performs better with the ester, it doesn't matter. It's no longer an approved formula. So you either have to accept the API's indirect ceiling on performance or ditch it to make a better product.
Approvals and certifications are good for weeding out the scammer gas station brands trying to sell you line flush as engine oil. Some set a little higher bar than your typical API minimums. They all indirectly create a ceiling though. If you're looking for a better performing oil than what you see on the shelf, you have get certifications off your mind.