I think the problem is that even if they are "allowed" technically (which may not even be true, I've seen 250g as the weight limit in some places), you're supposed to have advance permission from DGCA for the import, an identification number for the drone, and an operator permit for yourself, in hand. Honestly I think in classic Indian bureaucracy fashion, they've set things up so they can nail you and confiscate your drone or fine you in just about any circumstance. They may be as paranoid about drones as of satellite phones.