You are grossly oversimplifying the process. It's not as easy as saying "generate me a 1st - 12th level adventure featuring mind flayers" and getting Phandelver and Below. Even using an AI that isn't going to hallucinate stuff you can't use, a real designer is going the adventure scenarios and make sure they make sense, real editors are going to and to check for 100 hp CR 1/2 goblins, and real playtesters are going to have to check to see if it all works. Then there are the artists making art and maps that matches the text, layout designers putting it all together and of course marketing (this IS a thread about Todd after all).
Could AI do much of this? Well, if WotC is willing to sell "slop" I guess so. Considering how much they took it on the chin for unauthorized AI art in Bigby and with MTG ads, I find it unlikely they are prompt generating much of this stuff in sufficient enough quality to lay off large amounts of staff. They are still trying to hold up a reputation, such as it is.
Then again, when we see a six-fingered Eliminster on the cover of Eliminster's Guide to Eberron and the Multiverse of Everything, I think we'll have our answer.