Yep, completely fair.
They mention:

How long will DeckHD support the custom BIOS firmware?
We plan to continue providing BIOS firmware support for the foreseeable future. We are also optimistic about having the opportunity to work together with Valve to release official BIOS which natively support the DeckHD screen.

Which sounds to me like they haven’t reached out to Valve and there’s pretty much no chance of that ever happening.