I think there are a couple issues at play here.
Firstly, Dish does not support PSIP on any of their receivers with ATSC tuners, as far as I'm aware. This is nothing new, and Dish has responded to complaints before, each time with a "we choose not to support it at this time", "that's the way it is" response. I've heard that the 811 supported it until recently. However, as an 811 user for 2.5 years, I can attest to the fact that there was no PSIP data for any of my locals, other than those that Dish carried as LiL. So, even those subscribers who pay for locals will still not get as complete data as PSIP might provide, and will see "digital service" for those locals that Dish doesn't carry. Digital subchannels, namely, but also including other digital programming not part of LiL.
The second issue is the fact that Dish just recently added (and then removed) guide data for many markets' digital subchannels. For those markets, this basically eliminated the need for PSIP, since Dish was providing the data. The benefit, whether provided by Dish or PSIP, is that the guide data would then allow name based recording on those digital subchannels, that one would previously have had to use timer based recording, as well as having a 3rd party source for program information (one not integrated into the receiver).
However, as has been stated, this guide data has begun disappearing as quietly as it was added. I'm disappointed. Dish intended something - they had access to the data to be providing it in the first place, so what are/were they holding back? They won't support PSIP integration, which would be ok if Dish provided the data, which they happen to have, but won't make available (for now).
I can only hope the guide data returns. It was nice while it lasted and was one of the main peeves I've had with Dish HD service.