Not only does Neil actively work for Sony, but he actually worked on the movies and tv shows...
Guess what when they make a God of War tv show, do you know who is going to get credited? Cory Barlog... most likely.
beyond that, there are rules to determine who gets credited. You'll notice that David Jaffe is still credited in the Twisted Metal tv series that is strongly based on the characters he created. If anyone has more of a reason to be complaining it would be Amy Hennig on the Uncharted movie.
The WGA has strict rules on who gets credited and how. If they were to make uncharted drakes fortune, I think Hennig would probably get credited, but because the Uncharted movie was a prequel she doesn't get credited any more than she would on an Uncharted 5 game.
Until Dawn isn't an adaptation of the original work, it's an expansion of the franchise. That's why she doesn't get credited here. It's simple as that.