Super area games still fooling Delhi buyers

Super area vs carpet area ka game abhi bhi chal raha hai kya? I'm eyeing a 2BHK in Lal Bagh, CGHS Group projects. Builder quotes ₹1.5Cr for 1200 sqft super area, but carpet area is barely 750 sqft. That's paying for almost 40% common space! Even as someone in real estate, it feels like a cheat. How do you negotiate this? Can we challenge the super area percentage, ya it's a fixed part of the all-in cost now? Trying to find the true per sqft cost. Any hacks for a clearer picture of usable space before signing? Confused.