I think his point is that, if our only alternative to fascism is to vote for a senile old man who was forced upon voters without a primary, then this system can’t credibly be called democracy.
Its not about how old the candidate is, its about not having other valid alternatives when you dont like the candidate chosen for you.
Edit: just to make sure the point gets across. Imagine going to a restaurant, the waiter asks if you want to drink moldy water or toxic industrial waste. You see behind him lies an array of normal, refreshing beverages but sorry, you weren’t given those choices so you can’t have any of that. Thats basically this election.
We live in a first-past-the-post voting system. These choices, Biden and Trump, are in part the result of that system. We need to change to a different system like rank choice voting or approval voting. But despite being flawed, our system is still a democracy.
If your choices are vote for A and democracy ends or vote for B, it isn’t really a choice. If it isn’t a choice, it’s not a democracy. It’s political theater. Not unlike mock elections in dictatorships.
You’re fucked either way, both choices are pathways to the same destination. Just at different speeds/ different routes.
By electing Biden democracy continues and we will have the opportunity for better choices. There are ways to fix our problems, but we have to be willing to fight for them. If we choose to keep fighting we can avert self-destruction. In this case it means voting for a neo-liberal. That’s a small price to pay for a shot at a better society and averting death camps.