No, the MPEG4 channel is being shown at 720p now, not the EI channel.
Oh. Now I understand. Although when you go from MPEG2 to MPEG4, it is already non-native. (Not pass-thru.) Wonder what additional affect there is.
BTW, the picture is messy today on MPEG2. But then NESN is probably beholden to the local folks when on the road.