I tried the tablo2go app but it didn’t work for me (entirely my fault, I missed that it needs python3 and I was using python2).
It did give me enough insight into how to communicate with the Tablo to write my own quick-and-dirty scripts (bash, wget, ffmpeg) to extract a list of what has been recorded, fetch the data, and assemble them into a working .mp4 file.
A bit of network sniffing showed me that there is more in the Tablo than what tablo2go does.
I think the Tablo device uses a RESTful API. Is there a document on it that I can look at?