No, Rs1275 is not incorrect information.
This news is from two years ago. Ankur Mittal had mentioned that banks pay ₹800-900.
If you don't know Ankur, he is the founder of CardInsider. He has considerable knowledge.
Even last year, he checked and found that banks pay ₹700 to ₹900 per customer.
Now, coming back to the ₹1275 cost—lounge costs vary depending on the airport and city tiers.
NPCI has also mentioned:
"The above price will be subject to change in case the merchant revises the same. The revised rates will be communicated to the member banks."
One more thing to consider: In the past few years, we’ve seen that most banks have set up their own lounge partnerships and discontinued card network lounges. Perhaps the reason for this is that card networks—whether RuPay, Visa, or Mastercard—charge slightly higher fees. Otherwise, why would banks feel the need to establish their own lounge tie-ups?