Well, in more gentle words, it does seem reasonable that his mental and physical condition will NOT get better between now and November, 2024.
Of course, we all wish him the best of health and a nice retirement.
Maybe Dem bigwigs realize that the dear old man probably could not finish a second term, so they will no doubt start giving Vice President Harris a bigger role.
For example, I have read that the Administration is planning a memorial to Emmett Till. This would be an excellent opportunity to showcase Vice President Harris and give President Biden a chance to start saying goodbye to an ethnicity that he has expressed great sympathy for since he was elected.