I do not believe that is true; nor has it been for many years.
I have read that for year, could even confirm when we switched from DirecTV to Dish many years ago, was obviously a softer picture.
If Dish no longer does so, never have read confirmation that is true, but even if they no longer have HD Lite, still does not change the fact that streaming provides a better picture then Satellite/Cable.
Streaming is working to make it better for it’s subscribers , specially with more and more content in 4K, Cable/Satellite seems ok with doing nothing, just keep losing content, never make the picture/sound better and hope subscribers keep paying the ever increasing price with no improvements.