I clearly remember the time when DD Sports was launched, there were full oage ads in newspapers informing about it and what all content they will air. DD Sports had great variety of live sports / highlights at that point of time (1998-2002)
One of the main reasons why DD Sports did not launch HD feed for this series would be that Fancode would not b okay with it. Primarily Fancode entered into agreement with DD so that series can have reach in areas where internet, ott has no or minimal presence while Fancode can continue catering to its target audience .
I am sure if this was not the case then series would have been available on HD channel and cable/dth operators would have also added it as event based channel