NRI investor: Noida Extension payment plans aur super area ka chakkar

My budget is finalized for a 2BHK in Noida Extension, but I'm really confused about the payment plans and super area calculations. I'm based in Dubai, so visiting Victory Infra projects in Sector 153 is tough. Builders ke reps yahan alag cheezein bolte hain. They're pushing construction-linked plans. But I'm hearing about this super area vs carpet area trap, where 1200 sqft dikhate hain, but actual useable space bahut kam hoti hai. Is this common with Victory Infra or generally in Noida Extension? How much difference can this make to the actual price and potential rental yield? Should I push for a down payment plan instead, even if it's higher upfront? Also, any reliable broker recommendations for an NRI who can't do site inspections? Need someone trustworthy for legal clarity and rental management.