Well, consider what you just said right there. Trump did exactly what you said - took it public - and what was the result? All the media outlets that were saying he shouldn't run took those statements and made them the centerpiece of even more articles saying that he shouldn't run. So it had the exact opposite effect of what he apparently wanted, which was completely predictable.
Trump obviously doesn't like the idea of the WSJ, etc., running articles critical of him and saying he shouldn't run. So what?? They have every right to do that, and media commentary on the merits of various potential candidates has been going on forever. Getting outraged and angry that someone has the temerity to criticize you publicly is just a really bad look, and it is hurting him politically. But he can't and won't stop it because that's just who he is. And it is going to cost him.
That is 100% true, but it's still better than weaponizing the government against your political opponents (including Trump himself), as Biden and the Dhimmicraps are doing.