Round count in a small compact carry handgun is their marketing point. They would not have achieved that with the larger body of the .30 Luger bottleneck cartridge.
Sounds like a slightly scaled down 9mm Luger.
https://gununiversity.com/30-super-carry/
Touted for fitting "12 cartridges into a magazine that would only hold 10 9mm Luger cartridges" it is also criticized for "less energy and expansion"...
The 9mm Luger is a very good self defense cartridge. The .30 Luger was an acceptable self defense cartridge. This new one is questionable.
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.