Dont believe HDFC blindly! they can say anything. Unlike Axis/icici they do not have any clear policies in CC.
Pixel card was not working in HDFC ecom offers, eg- Motorola has monthly offer for 10% hdfc, pixel does not work there, while other hdfc core card works.
BBPS has pixel card separate from rest of hdfc cards. You have no direct CS support.
Also apart from older bins of Tata neu cards, no other cobranded card works on HDFC ecomm offers!
So it's a third child of hdfc that too least favorite one though they may say whatever they want!