Yes they sure are. I have personally used the one in international arrivals, since I had about a 6 hour layover, and I can only check-in at the counter for a domestic flight, 3 hours prior to dep. Decent place to sit and stretch. They have sleeping rooms, however, they are not covered under the PP.

I used the sleeping rooms once, as I had about 7 hour layover, and didn't want to go to an actual hotel (read: navigate through Delhi traffic and catch max. Zzzzzs). Clean and functional. Not a Le Meridien by any stretch, but they have attached bathrooms and shower facilities, which are a plus. For me, it was a well spent USD 80 for 8 hours!