People are also forgetting that he spent the past decade creating systems and tech for NMS that he can now use in his new game. Systems and Tech he didn't have in hand when dreaming up NMS.
That's a false dichotomy. They oversold (read: lied about) NMS, so I have no reason to trust that they won't do so again on this one. Trust is earned, and I have no reason to take them at their word. I trust other devs that consistently deliver, such as Rockstar and Nintendo.
So I'll believe it when I see it. But I'll require actual proof this time instead of promises. The same goes for CDPR and Bethesda and every other studio where promises didn't line up with what was actually delivered.