Of course those methods are already there. This is a new addition to these two methods. It was printed in the HDFC bank form. Did not confirm by email though.
Recently filled up the form for HDFC Regalia Credit card. The Bank official informed me about the changes to LTF criteria. A new addition was applying for add on cards at the time of CC application. That is one of the ways to get the card as LTF.
This being a very recent update,is not reflected...