“Is IndieDroid NOVA no longer supported?” - it was never officially supported. This is just a rebranded chinese 9tripod board which was meant to have “documentation and support based in U.S.A” - whatever that means, given that most chinese boards are actually doing better than this and the bar is super low.
What happened in reality is: they sent out the lowest spec boards to a few developers in the community with the hope that they would provide support for free. They have indeed provided some initial images and then moved on with their lives.
They aren’t paying anyone to work on software, as such you cannot expect updates or any kind of support.
When it comes to such boards, I’d suggest sticking to popular ones. I won’t name any brands here so it isn’t considered advertisement, but you can google them. They’re cheaper, have much better I/O (e.g. M.2 slots) and benefit from greater community interest.
It’s a shame because if ameriDroid put a bit of thought into this and considered paying/hiring 1-2 people rather than wasting all money on dev samples trying to support dozens of half-working distros (jack of all trades, master of none), they could’ve had an excellent official OS image and documentation. Even if the board is technically inferior in terms of I/O to other offerings, having good software support is a huge selling point and people wouldn’t even care as much about pricing.