No, they are not:
Previous models can work in a limited unsupported manner, but they are not in fact supported.
I have not personally used these devices, so I do not know how they present within Channels. But your statement of:
does not necessarily mean that is the case. Can you provide a screenshot for how the data is assigned? Also, can you provide screenshots of all portions of the settings related to your Tablo tuner and its guide, please?
The more actual details provided, the better support you might receive. You started this thread in August, and this is the first time there has been any indication that you are having issues with an unsupported Tablo tuner.