Indeed, these are for-profit companies who will handle the porting job or assist you in it (they're not all publishers, mind). They could be more transparent, I agree, but as they want to sell a service, public documentation is probably not their priority. That would be the Godot project's role, except as they explained in a recent blog post [1], as a free software and entirely public project (not a company), they couldn't work on console-specific code let alone host it or document it. It could be done in private by volunteers, but it hasn't been the case so far, only for-profit companies did it - likely because of how complex it is, and how tricky working with console manufacturers is.

So the state of Godot on console is out of Godot's hands, and that's why there is no documentation on it right now. But that might change with a company focused on bridging the gap between Godot and console manufacturers, which one of the W4 founders is alluding to [2].

[1] https://godotengine.org/article/godot-consoles-all-you-need-...

[2] https://twitter.com/reduzio/status/1556931546665422851