I call hogwash!
http://www.lyngsat.com/packages/expressvu2.html
I see 2 HD channels per transponder.
With 2 exceptions:
Transponder 6: HD PPV3, HD PPV5, HD NHL Centre Ice1
NHL Centre Ice is NOT a full time channel (far from it) so there is very little impact here.
Transponder 20: HD MC, HD MC2, HD BEV Promo Channel (829)
The HD BEV Promo Channel (829) is also found alone on Transponder 30 so perhaps they don't use the one on Transponder 20. Even if they do, I don't care because I'm in the east and get TMN, not MC.
Please show me proof that BEV carries 3 HD channels per transponder anywhere else.