For PADI, the 2 dives are now optional (simulated or real). To be honest, the dives would be sort a waste of time as diving on Nitrox is really no different than diving on air in terms of the dive experience!There are two real or simulated EANx dives for certification. The standards allow one of the two real EANx dives to be an Adventure Dive, thus one of the five in-water AOW dives, and allow the other EANx dive to be done concurrently with another Adventure Dive. So, by offering you EANx certification as part of your AOW, they are having to provide two cert cards, but only do four real training dives with you; the EANx Adventure dive is just a dive....no in-water training. Or, demand a real training dive (like the Night you want), but then pay separately for EANx....which is indeed good to have. I don't think the shop is scamming you, but they are being disingenuous by saying it is part of the AOW....
What matters is understanding the theory, knowing how to analyze and log your actual Nitrox blend on the tanks you will be diving with, and how to set up your dive computer and monitor the critical Nitrox related parameters (reduced MOD, ppO2, CNS, etc.,) and warning signs (VENTID-C, etc.,). The E-learning and classroom sessions covered all of that and we also got hands on experience analyzing and setting up our computers.