To me, it shows dems had no intention of winning. They could have easily said "Biden has been diagnosed with cancer. He will be finishing his term but with fewer duties." Or they could have pinned the economy and Palestine on it, saying it impaired his judgement. People would have ate that shit up, bending over backwards for why it's good, actually, that Biden is sacrificing his own health in duty to the country.
It provides Harris with more support because it doesn't look like a coup d'etat. She's legitimately taking over because the president is ill. The primaries can happen earlier and she likely wins because she's shown "how presidential she can be." She can debate Trump instead of that disaster we saw where Biden was bragging about how much of a better golfer he is.
But no. They pretended like Biden was completely fine and Weekend at Bernie's his old dying ass all over for everyone to speculate about. The Dem's base of ghouls was left feeling like they got betrayed. They waited for shit like George Clooney opeds to force a decision.