Did you read the article?

By moving the first debate to before the Democratic convention in August, Democrats increase their option value. Here’s what I mean by that. If Biden totally and irrecoverably screws up in the June debate — he’s just obviously no longer ready for prime time — then he can step down and Democrats can pull the Ezra Klein break-glass-in-case-of-emergency plan and hold a contested convention. It’s not ideal — that’s an understatement — but it’s much less bad than going into the final months of the campaign certain to lose.