It's not really a lie. As I understand it is that since NESN HD is only being fed(for the time being) on the Boston area spotbeam. They(Directv) can only be sure people in the Boston DMA can receive the signal, thus they are only allowing people in the Boston DMA to receive it. They cannot be sure everyone, outside the Boston DMA can actually pick up the Boston spotbeam and rather than dealing with the (very?) few people(who are eligible to receive NESN HD), who can't pick up the spotbeam, they screw EVERYONE who is outside the Boston DMA and don't offer any of them NESN HD.
It really stinks that Directv has chose this route. It's a DOUBLE whammy for me. NESN is deemed to be my HOME RSN, yet I cannot get NESN HD, because I am in CT, under the Hartford DMA. This also happens to me, with YESHD, because that falls under the NYC DMA/spotbeam.
I don't understand why they just can't make it available to others outside the DMA(if they are authorized, of course) and just let people try and see if they get it. If they can't, then they can't and would have to wait, but if you can, then great, you are all set. I understand this will change, when the new HD birds come online, but it's still stupid that they are doing it this way, now.