Which means, broadcaster stopped separate SD feed and also removed HD symbol from HD feed so that downscaling it to SD for SD customers will not tell them it is downscaled.
I think a separate thread is going on about this change from all Nat Geo channels.
IMO Nat Geo should do the same for all channels like Nat Geo, Nat Geo Wild, etc. They should only keep HD feed and DTH companies can show both HD as well as downscaled SD feed.