So these guidelines came out in the last couple of days. The term they've used is "institutional quarantine". It is quite possible that the govt. doesn't have so much space in their facilities to quarantine everyone who is hopping on a plane to DEL. So they will probably be using nearby govt. designated hotels and other facilities.

As the skies open up and we have more and more flights that come in... I suspect many of the airport hotels designated for this will also become full fairly quickly.