I am in the same boat. I just bought a four channel Tablo. I did quite a bit of research on ways to cut the cord and thought this was a good option for us. It came today, and I set it up only to find that our Chromecast devices that we use with our iPads all the time for everything from YouTube, to Netflix, to HBO Go, will not cast to the Tablo. I also feel misinformed. Technically, yes it will work with Chromecast and iOS, just not together. Why?
The fact that this issue has been around since 2014 tells me not to get my hopes up. I am very disappointed. Hopefully you guys can add much needed Chromecast functionality to your app on the iOS platform.