You're definitely right in that it's not unusual and quite common. It's just that given the high profile of her behavior these past two or so years, and the conversation surrounding whether people can support the future HP-related projects if she's at all attached them (and will profit off of them), which was discussed with the new game, and then its success despite the discussion sort of showing JK Rowling is not poison to the franchise, the fact that Zaslav is going out of his way to shine a light on her active involvement with this upcoming series is more than just giving a creator some sort of credit to make fans feel better about the direction of the upcoming project. He as a vested interest in making sure her name is out there and shone in a positive light beyond profit.I don't think it's that unusual for a high profile author to get this sort of production credit. George R. R. Martin was an executive produce on Game of Thrones, for example. So was Michael Crichton on E.R., and Stephen King has a bunch of production credits.