Apparently, Mangold did it to snipe at the Internet personality Doomcock for reporting the replacement of Indiana:
And Doomcock apparently was right, as one news source independently confirmed the replacement:
Phoebe Waller-Bridge could replace Harrison Ford as Indiana Jones
It might seem like "just a coincidence", but considering that Disney also targeted Doomcock before in
She-Hulk, it does comfirm something that Doomcock himself has said about him living rent free in their heads.
Frankly, at this point, I don't know what is true or not. But considering the projects that Kennedy had direct involvement in have fallen flat while those where she did have a big hand in it (namely The Mandalorian), it does seem like something is going on. And from my own personal observations of some of the stuff that has come out, I can see that there's a lacking in quality in story and character in most of the works presented that she's had direct involvement in. But, again, I don't know what is true or not anymore. As far as I'm concerned, the previous Indiana Jones film will be the last one for me, and it will basically lead into the
Young Indiana Jones TV series.