The Tablo app is developed by Nuvyyo USA, LLC, so they would be the ones to fix it.
Though I do have sympathy with developers on the Roku platform that get their apps broken by Roku updates. One obscure channel I used to watch has been working on getting compatible with a Roku change from about a year ago. They're still saying: Soon! (I think these folks are a much smaller operation than Nuvyyo/Tablo so hopefully the latter will be fixed sooner!)
Banned but back. Because why not?