That’s unclear. The question was ask while running firmware several versions prior and previous generations devices. They never responded if it was still current.
As for Roku comparability, tablo does provide this disclaimer on the Roku tab in Tablo Compatible Streaming Set-Top-Boxes & Sticks
(Older ‘legacy’ models such as the Roku LT and original streaming stick are not supported.)
There are other topics about resuming not starting where expected, but I believe most of those are recordings starting at the beginning.