What, announcing his cancer?
First off, he didn't make that move, his handlers did. His brain is now pudding and he was never that smart to begin with, nothing he does himself can be characterized as "brilliant".
Second, the timing probably has little to do with Trump, and more to do with the release of the Hur interview tapes, which make even more pubic his diminished mental capacity while in office. We are still a long ways off from a proper reckoning of that coverup, and what we see now is a mad scramble to avoid accountability. The media is finally ready to
blame others for their own participation in that coverup, but they have yet to come to terms with their own culpability, and they are noticeably NOT interested in finding out who actually was making the decisions during Joe's presidency.