Aadhar was originally sold as just an ack this number matches those finger prints.
Now in the 2016 act, it provides all those details. All of which are enough to determine your religion, caste and more.
The issue is not about the tech, it is about trust and about rights.
None of which are directly responsible for increasing GDP, just the same way GDP is not responsible for making the difference between being a bunch of companies and being a nation.