I really didn't like the sound of that paragraph, I dunno if this is any better. Sorry I cant add meat, as the topic is beyond me.
Without debating the questionable terminology and tone of the quoted material, the simple technical statement that the 5.7x28mm cartridge can penetrate 48 layers of Kevlar is very misleading. Only one type of this ammunition can penetrate to that degree. Classified specifically by the BATFE as armor piercing, that ammunition is the SS190. Consequently it can only be sold to law enforcement and military agencies. Therefore, the ammunition is only released and shipped from U.S. Customs controlled and bonded warehouses upon BATFE and U.S. Customs approval.