OK, so if I understood the video correctly, the change is with the newer Rokus. The video didn't mention it, but the last MPEG-2 patents finally ran out last year. The video did say it worked with all currently shipping Rokus, so presumably those all support MPEG-2 now. Thus you don't need an HDHR that transcodes to use the new app.
It loaded onto my Roku just fine, and it did download my channel list from my HDHR, but nothing seems to play. I suspect my Roku and/or HDHRs are too old to work with it.
BTW, the app's interface reminds me somewhat of the original Sling TV app, with a row of channels and another row showing the current and upcoming programs on the channel currently selected. (Of course Sling TV is a streaming service, so on most channels you could scroll backward in the list of programs and watch a program that had already aired. That obviously isn't possible with OTA TV.)