The fact that we keep seeing these kinds of news (including the report that “he’s at his best from 10AM to 4PM”) means it’s highly likely that there’s people with high positions in the Democratic hierarchy who think they should switch their candidate (in opposition to whoever is calling the shots), and they’re trying to rock the boat earlier rather than latter by leaking these headlines so that the second option actually has a chance to build their candidacy.
If you think they shouldn’t, I ask you: do you prefer this to be published now, in a controlled demolition by people who want someone other than Biden, or weeks before the election, by people trying to make Trump win?