Yes, that is it. They KNEW Biden was only a figurehead, a dummy they could push forward to be replaced by their (younger, more charismatic replacement) for an 8-10-12 year office run as VP and then President-in-all-but-name as soon as possible.
But why Harris? Why did “they” have to get her and not somebody from the Obama insider’s group? Harris brings nothing nationally, she is failing at gathering back Hillary’s women vote, Obama’s black vote, the socialist (Sanders-Pocohauntus-Beto) and youth vote.
Why Harris?
The idea is to make Kamala president, probably within a month if Biden is elected. She’s the most left-wing member of the Senate and has revealed herself to be a communist. That’s why she was put forward and Biden just went along with it. He probably had nothing to with the selection.
As you said, Biden is just a figurehead to convince a bunch of dumb Democrats that the old party is still in control. Not true. He probably doesn’t even know what’s going on. He’s a doddering old man who is so out to lunch mentally he isn’t aware that he’s just being used. It is frightening.